Vladimir Putin insists Moscow is "not threatening anyone" and merely responding to statements by Western leaders.

Seven people were killed in the attack and emergency power cuts were imposed in Kyiv and three other regions.

Kaliningrad has long been a source of tension between Russia and Nato, given its strategic location on the Baltic Sea, and the potential for Russia to cut off the three Baltic states from the rest of their Nato allies if they were to annex a land corridor between the exclave and its military ally Belarus.