By. Antonio Errico[1] – AOS Senior Advisor

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The following text presents a synthesis of the key naval warfare lessons learned from the ongoing conflict in the Black Sea, analysing the paradigm shift from traditional fleet-on-fleet engagements to multi-domain, sensor-driven asymmetric warfare. Grounded in the operational realities of the Russia-Ukraine war, this analysis highlights how low-cost unmanned surface systems, coastal defences, and electronic warfare have successfully contested sea control against a conventionally superior naval power.

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[1] Ing. Antonio Errico, Italian Navy officer retired, with a wide programmatic and technical expertise in the fields of Combat Systems, C4I and Ballistic Missile Defence Architecture. is a defence expert and naval analyst specializing in maritime warfare, strategic military technologies, and C4ISR systems. With extensive experience in analysing international conflicts, he focuses on the operational integration of unmanned systems (USVs/UUVs), electronic warfare, and asymmetric coastal defence. He regularly publishes strategic analyses on contemporary naval doctrine, translating recent battlefields lessons, such as those from the Black Sea, into actionable defence insights.

1.              Introduction

The rapid evolution of robotic weapons is changing the battlefield in real time. The latest models of Ukrainian sea drones, like the Sea Baby and Magura V5, are no longer just simple remote-controlled boats. Today, they are highly advanced systems. They now use Artificial Intelligence (AI) for automatic targeting, dodging enemy fire, and finding their way without GPS. Some models have even been modified to carry air-to-air missiles (like the R-73 or AIM-9) to shoot down enemy helicopters and aircraft flying at low altitudes.

The Black Sea conflict represents a structural inflection point in maritime warfare. It demonstrates that future naval operations will be characterized by distributed, unmanned, electronically contested, and cost-asymmetric engagements, where traditional fleet dominance is insufficient without resilience, adaptability, and multi-domain integration.

Traditional naval superiority based on ship numbers and tonnage is being replaced by:

• Distributed and connected sensors,
• autonomous strike systems,
• electronic warfare dominance,
• and coastal denial architectures.

The contemporary maritime battlespace is defined by persistent contestation, multi-domain integration, and unmanned system proliferation.

Based on observed operational patterns, open-source assessments, and reported engagements, some lessons learned can be derived from the Ukrainian-Russia war on the Black Sea, and some key points are summarized here below.

The Black Sea conflict demonstrates a transition in maritime warfare from platform-centric fleet engagement to multi-domain, sensor-driven, and asymmetric maritime denial operations.

A conventionally inferior naval actor has successfully contested maritime freedom of action through:

• shore-based precision fires,
• unmanned surface and aerial systems,
• electromagnetic spectrum operations,
• and distributed targeting networks.

The result is a persistent condition of contested sea control, particularly in littoral and near-shore environments.

In discussing the lessons learned identified, however, there is an important caveat.

The war in the Black Sea offers valuable insights into contemporary maritime warfare, but its lessons must be carefully considered taking into account the region’s unique geographic characteristics as an enclosed maritime theatre. The Black Sea is defined by restricted access through the Turkish Straits, comparatively short operational distances, limited maneuver space, and the close proximity of littoral states, all of which compress the maritime battlespace and amplify the effectiveness of land-based strike systems, naval mines, and uncrewed platforms. These conditions have enabled capabilities such as sea drones and coastal missile systems to achieve operational effects that may be more difficult to replicate in open-ocean environments.

2.              Sea Denial Over Sea Control (Stopping the Enemy is Easier than Controlling the Sea)

The conflict confirms that sea control is no longer a prerequisite for operational effectiveness in confined maritime theatres. Modern naval warfare does not require sea control to be effective; sea denial is sufficient to neutralize a conventionally superior Navy.

The Ukraine-Russia naval war has proven that small, non-naval states, without a traditional fleet, can neutralize heavy fleets by using asymmetric warfare, relying primarily on low cost Uncrewed Surface Vessels (USVs), drones, and land-based cruise missiles, , to severely restrict a superior adversary’s maritime operations, limiting Russian naval freedom of action, while Russia’s Black Sea Fleet has been forced into defensive posture and port relocation (e.g., from Sevastopol to Novorossiysk).

Coastal missiles and unmanned systems have replaced fleet-on-fleet engagements as primary tools of maritime influence.

Lesson: Littoral zones can be contested and dominated by asymmetric systems without surface fleet parity.

3.              Unmanned Systems are Now Primary Naval Combatants

The conflict marks the operational maturity of naval drones (USVs and UUVs), as the Ukraine’s USVs (e.g., Magura V5, Sea Baby) have struck warships, ports, and infrastructure. These systems operate as:

• one-way attack platforms,
• reconnaissance tools, and
• modular weapons carriers.

causing significant damages to Russian naval assets and forced doctrinal change.

It has been demonstrated that USVs and supporting unmanned systems have a credible offensive capability against surface combatants and port infrastructure, despite their limitations, as USVs are heavily dependent on weather conditions.

Lesson: Unmanned systems must be considered as primary combat elements, not adjunct capabilities.

4.              Cost Imbalance is Strategically Decisive (Cheap Weapons Can Destroy Expensive Ships)

A major lesson is the asymmetric cost exchange ratio, with low-cost drones (tens to hundreds of thousands of USD) versus high-value naval vessels (tens to hundreds of millions USD).

Even when many drones are intercepted, a single successful strike can disable capital ships, degrade fleet readiness, and force expensive defensive adaptations.

Lesson: Naval survivability is now economically as well as physically contested.

5.              Electronic Warfare is as Important as Kinetic Warfare

Electronic warfare (EW) has proven decisive in shaping sensor performance, navigation integrity, and weapon effectiveness. Drone effectiveness depends on EW resilience more than just explosive payloads, so the control of the electromagnetic spectrum is essential for maritime operations.

Maritime operations shall be planned under conditions of continuous electromagnetic interference, degradation, or denial. Positioning, navigation, timing (PNT), and communications systems shall be assumed to be contested at all times.

Lesson: Control of the electromagnetic spectrum is decisive for maritime operations.

6.              Port and Littoral Infrastructure are Primary Targets

Another key aspect of the modern naval warfare is that it focuses even more on harbor and relevant infrastructure (port, bridges, fuel depots, etc.) rather than on open sea engagements.

Naval bases and logistics nodes are now continuously contested operational environments.

Modern naval warfare increasingly focuses on harbors rather than open-sea engagements.

• Russian fleet assets have been struck while docked or near port defenses.
• Static infrastructure (ports, bridges, fuel depots) is now more vulnerable than ships at sea.
• Even heavily defended bases require layered defenses against air, surface, and underwater drones.

Lesson: Naval power is now deeply dependent on land-based survivability.

7.              Sub-surface and multi-Domain integration is emerging (Land, Air, and Sea Operations are Connecting)

The war shows rapid convergence of different domains, between surface drones (USVs), aerial drones (UAVs), and emerging underwater drones (UUVs).

Reported developments include:

• Coordination of drone swarms,
• “Drone mothership” concepts, and
• Multi-vector attacks combining air + sea + cyber effects.

Maritime forces shall assume persistent adversary situational awareness enabled by fused sensors networks.

Lesson: The future naval warfare is inherently multi-domain and networked.

8.              Logistics and Supply chains are Maritime Vulnerabilities

The conflict demonstrates that:

• naval warfare is fundamentally about sustaining logistics routes,
• interdiction of shipping and resupply can be more decisive than ship sinking alone,
• commercial and military maritime traffic are intertwined in modern conflict.

Lesson: Maritime logistics disruption is a strategic weapon, not a secondary effect.

9.              Rapid Innovation cycle

Tactical, technical, and procedural adaptations occur on compressed timelines, weapon systems evolve within months, not decades, and civilian technologies (composites, AI navigation, Starlink-class comms) are rapidly militarized.

Naval doctrine and capability development must assume continuous battlefield-driven innovation, with a rapid integration of lessons identified.

Lesson: Doctrine must be iterative and update-capable, with accelerated lessons-learned integration cycles.

10.           Key Events and Lessons Learned

#	Lesson Learned	Real-World Reference Event	News Reference / Source
1	Sea Denial Over Sea Control (Stopping the enemy is easier than controlling the sea)	The Russian Black Sea Fleet was forced to leave its main base in Sevastopol (Crimea) and retreat to Novorossiysk.	The New Voice of Ukraine “Atesh says Russia preparing to move Black Sea Fleet command from Crimea”
2	Unmanned Systems as primary Combatants (Sea drones are now primary combat weapons)	The sinking of the Russian corvette Ivanovets and constant strikes carried out by Ukrainian Magura V5 sea drones.	Wikipedia / Grokipedia “MAGURA V5 – Key Engagements and Verified Strikes”
3	Cost Imbalance is Decisive (Very cheap weapons destroy highly expensive ships)	Using drones costing around $273,000 to hit and disable warships worth hundreds of millions of dollars.	The Guardian “It is a war of drones now: the ever-evolving tech dominating the frontline”
4	Electronic Warfare is Key (Electronic warfare is as important as physical weapons)	Upgrading drones with anti-jamming systems and navigating under continuous GPS/PNT signal blockages.	The Guardian “They cannot be jammed: fibre optic drones pose new threat in Ukraine”
5	Ports and Infrastructure are Primary Targets (Harbors, ports, and bridges are primary targets)	The major attack using “Sea Baby” marine drones that heavily damaged the Crimea (Kerch) Bridge.	The Guardian “Ukraine intelligence agency says sea drones carried out Kerch Bridge attack”
6	Sub-surface and Multi-Domain Integration (Air, surface, and underwater drones work together)	The development of modified “Sea Baby” drones carrying air-to-air missiles and rocket launchers to hit land positions.	Euromaidan Press “Ukraine put armed robot on Russian-held ground. Naval drone was landing craft”
7	Logistics and Supply lines are Vulnerabilities (Supply lines are strategic weak points)	The disruption of Russian oil tankers and cargo transport in the Black Sea using kamikaze sea drones.	Naval News “Russia’s massive Black Sea problem is worse than it looks”
8	Rapid Innovation Cycle (Technology and tactics must adapt in months)	Integrating AI auto-targeting systems and Starlink-class satellite antennas directly on naval drones.	Ukrinform “Legendary Sea Baby drone that struck Crimean bridge now on display in Kyiv museum”