Two huge factors at play there.Successful interception of Russian missile dropped to 46% on average for both drones and missiles
For Missile it dropped to ~30%
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1. Ukraine ran low on missile interceptors due to the delay in the U.S. package. That is far less of a problem now.
2. Russia moved away from attempting concentrated strikes on places like Kyiv and Lviv where rationed air defenses remained reasonbly plentiful, and instead increasingly targeted areas of the country with low levels of air defense coverage.
Like Russia (who has seen meaningful damage done to their oil refining innfrastructure) Ukraine simply does not have enough air defense capability to defend the skies over the entire country. Naturally, they have to choose which areas they most heavily defend, and which targets are worth using expensive air defense missiles that are hard to get, to defend.
I expect to see the interception rate trend back into the 70%+ territory with the arrival of additional Tier 1 and Tier 2 air defense systems (Patriot, SAMP/T and IRIS-T), as well as F-16s that will fly top cover over places like Kyiv, Odessa and Lviv.