Putin ordered a special military operation in eastern Ukraine and demanded the army lay down their weapons.

Russia's president claimed in an address broadcast on Russian state television that he was not planning to occupy the country.

All responsibility for the possible bloodshed will be on the conscience of the ruling regime, he said.

Russia's response will lead to consequences that you have never encountered in your history, Putin warned other countries.

As he accused Putin of launching a premeditated war that will bring a catastrophic loss, US president Joe Biden said the prayers of the entire world.

Russia alone is responsible for the death and destruction this attack will bring, and the United States and its allies and partners will respond in a united and decisive way. Biden said in a statement that the world would hold Russia accountable.

Biden said he would reveal further measures to punish Russia when he met G7 counterparts on Thursday.