Ukraine had the chance to take out Russian bombers parked on the ground in June, but Washington’s restrictions on ATACMS strikes on Russian territory denied Kyiv its fleeting opportunity.

From: Kyiv Post — On Monday, Ukraine’s Defense Intelligence (HUR) reported a successful strike on the Morozovsk military airfield in Russia’s Rostov region over the weekend, destroying and damaging multiple Su-34 fighter bombers some 130 km from the Ukrainian border.
But a few months prior, according to a Forbes report, Ukraine could have damaged or destroyed scores more when dozens of the same planes were parked at the Voronezh Malshevo air base, less than 300 km from the Ukrainian border. Unfortunately, for Kyiv, the US was still preventing Ukraine from striking Russian territory with its most sophisticated American-made missiles.
Destroying the Su-34 jets has been of utmost importance to the Ukrainian military as they carry powerful glide bombs – some weighing three metric tons with the ability to destroy multiple houses in one hit even if they missed their target – that continue to plague the frontline troops.