Russia today accused Ukraine of attempting to kill President Vladimir Putin. It claimed it shot down two drones which were used in the alleged attack. It said Russia reserved the right to retaliate - a comment that suggested that Moscow might use the alleged incident to justify a further escalation in the 14-month-old war with Ukraine. Putin was not injured and there was no material damage to the Kremlin building, it said, adding it considered the alleged attack "a planned terrorist act and an attempt on the life of the President of the Russian Federation."