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

Seven people, including a child, were killed across Ukraine during the assault, according to Ukrainian President Volodymyr Zelenskyy.

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.