Despite collapse of USSR, Russia is one of most powerful nuclear powers: Vladimir Putin warns world

Despite the threat of ''harshest sanctions'', enormous international pressure and appeals for peace, the Russian troops continued to invade Ukraine on Thursday and mounted an assault by land, sea and air in the biggest attack on a European state since the Second World War. Russian President Vladimir Putin has warned the United States and its NATO allies that any attempt to interfere would lead to ‘severe consequences you have never seen.’