Russian President Vladimir Putin Friday said that Ukraine's counteroffensive, launched to push Russian troops back in the south and east of Ukraine, was failing despite military and financial support from Western countries.

"In any case, there are no results yet" of the counteroffensive, Putin said in televised remarks from a meeting of the Kremlin's Security Council.

Putin also singled out Poland and accused its leaders of trying to "directly intervene in the conflict" to occupy Ukrainian land.

Ukraine last month launched a long-anticipated counteroffensive after stockpiling Western weapons.

"Neither the colossal resources that have been pumped into the Kyiv regime nor the supplies of Western weapons, tanks, artillery, armoured vehicles and missiles are helping," Putin said.

Moscow's forces still occupy swathes of southern and eastern Ukraine and large parts of the front appears to be frozen.

Earlier this week a senior presidential aide in Ukraine, told reporters that the operation would be "long and difficult" and called on allies to send more armoured vehicles and weapons.

Poland, one of Ukraine's staunchest allies, has provided Ukraine with arms and welcomed refugees, which has however shown no interest in sending troops to Ukraine.

Belarusian territory which borders Ukraine as well as EU and NATO members, has served as a launching pad for Russia's Ukraine offensive.

Putin therefore warned that Moscow would use "all the means at our disposal" to protect Belarus in case of an attack.

"Unleashing aggression against Belarus will mean aggression against the Russian Federation," Putin said.