A Russian military plane crashed near the border with Ukraine, killing all 74 people on board.
The plane came down in the south-western Russian region of Belgorod, with the local governor claiming that 65 Ukrainian prisoners of war were on the aircraft.
Russia claims the jet was shot down in the Belgorod region by Ukrainian missiles.
Kyiv says it is looking into what happened, and has urged people not to jump to conclusions.
Kyiv correspondent Megumi Lim spoke to Ingrid Hipkiss.