Delays in the provision to Ukraine of Western long-range fires systems, advanced air defense systems, and tanks have limited Ukraine’s ability to take advantage of opportunities for larger counter-offensive operations presented by flaws and failures in Russian military operations. Western discussions of supposed “stalemate” conditions and the difficulty or impossibility of Ukraine regaining significant portions of the territory Russia seized in 2022 insufficiently account for how Western delays in providing necessary military equipment have exacerbated those problems. Slow authorization and arrival of aid have not been the only factors limiting Ukraine’s ability to launch continued large-scale counter-offensive operations.

Factors endogenous to the Ukrainian military and Ukrainian political decision-making have also contributed to delaying counteroffensives. ISW is not prepared to assess that all Ukrainian military decisions have been optimal. (ISW does not, in fact, assess Ukrainian military decision-making in these updates at all. Yet, as historians, we have not observed flawless military decision-making in any war.)

But Ukraine does not have a significant domestic military industry to turn to in the absence of Western support. Western hesitancy to supply weapons during wartime took insufficient account of the predictable requirement to shift Ukraine from Soviet to Western systems as soon as the West committed to helping Ukraine fight off Russia's 2022 invasion.

The military aid provided by the US-led Western coalition has been essential to Ukraine’s survival, and this report’s critiques illustrate the importance of that aid as well as its limitations. Western military advising before the February 24 invasion helped the Ukrainian military resist the initial Russian invasion. Western weapons systems such as the Javelin anti-tank missile helped Ukraine defeat that onslaught and throw the Russian drive on Kyiv back to its starting points. The provision of essential Soviet-era weapons systems and munitions by members of the Western coalition has kept the Ukrainian military operating throughout the war.
The delivery of more advanced Western systems such as the US-produced 155mm artillery (in April) and then HIMARS (in June) facilitated the Ukrainian counter-offensives that liberated most of Kharkiv Oblast and then western Kherson Oblast. The arrival of Western NASAMS air-defense systems in November helped blunt the Russian drone and missile campaign attacking Ukrainian civilian infrastructure.



The war has unfolded so far in three major periods. The Russians had the initiative and were on the offensive from February 24 through July 3, 2022, whereupon their attacks culminated. The Ukrainians seized the initiative and began large-scale counteroffensives in August, continuing through the liberation of western Kherson Oblast on November 11. Ukraine has been unable to initiate a new major counter-offensive since then, allowing the conflict to settle into positional warfare and allowing the Russians the opportunity to regain the initiative if they choose and to raise the bar for future Ukrainian counteroffensives even if they do not. The pattern of delivery of Western aid has powerfully shaped the pattern of this conflict.

Institute for the Study of War