Lessons from the war in Ukraine for modern warfare

The lessons from the war in Ukraine have absorbed general staffs, war colleges and think tanks around the world since 2022. It is the largest conventional war in Europe since 1945, and the first in which cheap drones, commercial satellites and electronic warfare sit alongside trenches, minefields and massed artillery. Not everything said about it stands on equally firm ground, though: some conclusions are close to unanimous, others remain hotly contested.

Below are ten lessons documented up to 2025 by bodies such as Britain's RUSI, the IISS and the Institute for the Study of War, each with an indication of how widely it is accepted. The piece does not attempt to describe the situation at the front at the time you read it.

The new has not replaced the old — it has been added on top of it.

Editorial summary of the analysts' debate

1. The battlefield has become transparent

Level of agreement: high. Persistent surveillance drones, commercial satellite imagery and mobile phones make it very hard to mass troops unseen. RUSI's Jack Watling has described how any concentration that is spotted can be struck within minutes. The result is dispersal: small units, concealment and constant movement.

2. Drones are now a weapon of mass

Level of agreement: high. Cheap first-person-view (FPV) drones have become one of the main causes of casualties and vehicle losses, according to assessments cited by both sides and by Western analysts. Kyiv said it produced more than a million drones in 2024. The lesson is industrial as much as technical: quantity and speed of adaptation matter as much as the quality of each airframe.

3. Electronic warfare decides what works from month to month

Level of agreement: high. Jamming of satellite navigation and radio links has reduced the effectiveness of drones and guided munitions; press reports based on Ukrainian assessments pointed, for instance, to a loss of accuracy in some GPS-guided shells. The response has been a constant cycle of measure and countermeasure, of which fibre-optic-guided drones — immune to radio jamming — have been one of the most visible examples since 2024.

4. Artillery and industry still decide wars of attrition

Level of agreement: high. RUSI estimated that at the most intense points of 2022 Russia was firing tens of thousands of shells a day. Europe discovered its industry was not ready: the EU promised Ukraine a million shells by March 2024 and, as EU foreign-policy chief Josep Borrell acknowledged in January 2024, would deliver only around half by that deadline. Attritional wars are won in factories too.

5. Prepared defences are very hard to break

Level of agreement: high on the diagnosis, contested on the causes. Ukraine's 2023 counter-offensive ran into deep minefields, trench lines and drones. Valerii Zaluzhnyi, then Ukraine's commander-in-chief, spoke in November 2023 of 'positional warfare'. Some analysts blame technology above all; others point to the lack of air superiority, of combined-arms training and of mine-clearing equipment.

6. Nobody owns the sky

Level of agreement: high. Dense air defences on both sides have stopped either air force from winning air superiority. That is why stand-off weapons — such as Russian glide bombs — and long-range missiles and drones have gained so much weight.

7. You can deny the sea without a big fleet

Level of agreement: high. With a very small navy, Ukraine sank the cruiser Moskva in April 2022 and, using missiles and naval drones, forced Russia's Black Sea Fleet to pull much of its strength back from Sevastopol, reopening routes for grain exports in 2023.

8. The rear is no longer safe

Level of agreement: high. In 2022 HIMARS rocket launchers forced Russia to move its depots away from the front. Since then, Ukrainian long-range drones have hit refineries and air bases. In June 2025 the operation Ukraine called 'Spiderweb' struck strategic bombers at several Russian bases using drones launched from lorries; the number of aircraft destroyed varies by source, with Kyiv's figures higher than Western estimates.

9. Soldiers are still the scarcest resource

Level of agreement: high. Both sides have struggled to replace losses. Ukraine lowered its mobilisation age from 27 to 25 in 2024; Russia has relied on large enlistment bonuses, prisoners and — as Moscow and Pyongyang acknowledged in 2025 — North Korean troops in the Kursk region. Technology has not removed the need for infantry.

10. Commercial technology is now military infrastructure

Level of agreement: high on the fact, open on the consequences. Starlink, commercial imaging satellites and civilian electronics have been essential. That raises a new question: what happens when a critical military capability depends on the decisions of a private company?

What is still debated

• Revolution or continuity? Stephen Biddle argued in Foreign Affairs (2023) that the war confirms more than it overturns classical principles: what matters is still how fire, manoeuvre and concealment are combined.
• The end of the tank? Armour has suffered heavy losses, yet both armies keep using it with cages, nets and jammers. Most analysts talk of adaptation, not extinction.
• Does it transfer? A NATO–Russia war, or one in the Pacific, would involve different geography, air forces and industrial scale. Copying lessons without context is a risk in itself.
• Casualty figures: estimates vary enormously by source and are used as propaganda; they should always be treated with caution.

Conclusion

The war in Ukraine has not reinvented warfare, but it has accelerated trends: cheap mass against expensive quality, transparency against concealment, industry against peacetime stockpiles. The lesson analysts repeat most often may be the simplest: the side that learns and adapts fastest wins.