Russia's defence ministry released video footage on Wednesday of what it said was a downed drone at a briefing intended to show Ukraine tried this week to attack a presidential residence and challenge Kyiv's denials that such an attack took place.

Russian Lt. General Fanil Sarvarov killed in Moscow car bombing as investigators suspect Ukrainian intelligence involvement in the deadly attack on Monday.

A Russian general was killed when a bomb detonated under his car in Moscow and investigators said Ukraine​ could be behind the attack.