https://www.forbes.com/sites/davidaxe/2025/03/27/the-triple-tap-raid-on-the-engels-bomber-base-cost-russia-96-billion/

$960 million worth of equipment destroyed, so 0.7% if Russia's entire (official) military budget lost in a single set of attacks.

In fairness, getting to the point where Ukraine could repeatedly hit of Russia's biggest and more important airbases certainly took a lot of preparation destroying anti-air systems between Ukraine and that airbase. But still, impressive.