What does Russia’s foreign ministry allege as the cause of the plane crash?

A Russian military plane crashed near Belgorod, close to Ukraine. It was carrying 65 Ukrainian prisoners of war, six crew, and three escorts for a prisoner exchange. The local governor reported no survivors, but details on the crash cause and the passenger list are unconfirmed. A video showed the plane going down near Yablonovo village, northeast of Belgorod. Russia accused Ukraine of downing the plane without proof. The flight originated from Chkalovsky air base near Moscow, heading to Belgorod.