The Ukrainian government has offered financial airframe guarantees for leasing companies this afternoon.
The situation is calm in Ukraine, so this appears to be an overreaction by a leasing company following an overreaction by what appears at this stage to be an insurer, following an overreaction by several governments, .
Release from the Ministry of Infrastructure here, the aircraft involved is UR-SQO, which is still at KIV/LUKK at the time of writing.