Biden's anti-radiation missiles last U.S bid to stop Putin's troops in Ukraine?

U.S has sent anti-radar missiles for Ukrainian jets to target Russian radar systems. The Pentagon acknowledged sending previously undisclosed anti-radar missiles. U.S didn't confirm the type of the missile supplied, but it is likely the AGM-88 HARM. War trackers' pics showed the remains of what appear to be the fin of an AGM-88 HARM. Some NATO members were part of Soviet Union, were upgraded jets secretly transferred? High likelihood - Ukraine fighters modified to carry the anti-radiation missiles.