Ukraine President Volodymyr Zelenskysaid Russian troops resumed missile attacks on Friday morning at 4am while declaring that both military and civilian targets were being hit.
The Ukraine president said Russian troops were stopped from advancing in most directions as reports said there was heavy bombing reported in capital Kyiv.
Zelenskytold a television channel that the "world is continuing to observe what is going onin Ukraine from afar."
The Ukrainepresident had said earlier said that a "new Iron Curtain" had descended and it "is closing Russia off from the civilised world".
President Putin had earlier said Russia's response would be "immediate" against "whoever tries to hinder us". "It will lead you to such consequences that you have never encountered in your history," the Russian president warned amid strikes against Ukraine on Friday.
Watch:Civilian areas of Kyiv report massive missile strikes
Zelenskyadded that sanctions imposed on Russia are "not enough".
Meanwhile, Reuters quoted Ukraine's government adviser as saying that Russia plans to break through into Kyiv with tanks. The government official said defenders in Kyiv were ready with "anti-tank missiles supplied by our allies".
Newswire Reuters quoting Ukraine's deputy defence minister said army units were "defending positions on fourfronts despite being outnumbered".
The minister reportedly said that Russian forces "may enter areas just outside Kyiv today".
(With inputs from Agencies)