Ukraine had the opportunity to destroy dozens of Russian aircraft with ATACMS missiles, but the U.S. prohibited their use, according to Forbes. In early summer, the Russian 47th Guards Air Regiment parked numerous Su-34 jets at the "Malyshevo" airbase, 160 km from the border. Ukraine requested permission from the U.S. to strike this base with ATACMS missiles, but Washington denied the request due to fears of escalation.
https://www.forbes.com/sites/davidaxe/2024/08/05/ukraine-had-a-chance-to-blow-up-russias-best-warplanes-on-the-tarmac-the-white-house-said-no-and-now-its-too-late/