The UN human rights chief on Thursday slammed Russia's attack on Ukraine, warning of a "massive impact" on the rights of millions and cautioning that heightened nuclear threat levels showed all of humanity was at risk.

After ringing Ukraine with tens of thousands of troops, Russia invades its neighbour in the early hours of February 24, setting off the worst conflict in Europe in decades.

Iran’s Supreme Leader Ayatollah Seyyed Ali Khamenei has blamed the United States for the current Ukraine crisis and demanded an end to the war, saying the policies of the West were the “root cause” for instability.

Facebook’s parent company Meta has announced plans to restrict access to Russian state media outlets RT and Sputnik across the European Union, as Russia pressed on with its invasion of Ukraine.