In a tense exchange with the Russian ambassador, Ukraine's representative to the United Nations has told the security council that Russian president Vladimir Putin has 'declared war on Ukraine'. Subscribe to Guardian News on YouTube ► http://bit.ly/guardianwiressub Russia’s representative to the United Nations, Vasily Nebenzya, has justified Russia’s military operations under article 51 of the UN charter, which allows for 'self-defence'. The council met as Ukrainian officials confirmed missile strikes on a number of Ukrainian cities, including the capital Kyiv. Ukraine's president, Volodymyr Zelenskiy, has introduced martial law while urging to people to remain calm. He added that he has spoken with US president Joe Biden, and told Ukrainians to stay home and to stay calm: 'The army works. I will be with you all the time. Stay strong. We will win because we are Ukraine. Glory to Ukraine.' Russia-Ukraine crisis live news: Putin has launched ‘full-scale invasion’, says Ukrainian foreign minister – latest updates ► https://www.theguardian.com/world/series/ukraine-live/latest The Guardian publishes independent journalism, made possible by supporters. Contribute to The Guardian today ► https://bit.ly/3uhA7zg Website ► https://www.theguardian.com/ Facebook ►https://www.facebook.com/theguardian Twitter ► https://twitter.com/guardian Instagram ► https://instagram/guardian #russia #ukraine #unitednations