What we know about the alleged drone attack on the Kremlin so far

Russia has threatened to retaliate against Ukraine for a failed attempt to assassinate President Vladimir Putin in an alleged drone attack on the Kremlin citadel in Moscow. Kyiv has denied any involvement and accused Russia of readying itself for a major offensive in Ukraine. Here's what we know so far about Wednesday's alleged attack: Moscow said two drones had been used in the alleged attack on Putin's residence in the Kremlin citadel, but had been disabled by electronic defences. "We regard these actions as a planned terrorist act and an attempt on the president's life, carried out on the eve of Victory Day, the May 9 Parade, at which the presence of foreign guests is also planned," the Kremlin said in a statement. "The Russian side reserves the right to take retaliatory measures where and when it sees fit."