Update: This story has been updated to include the latest news, bulleted below. Russian troops launched their anticipated attack on Ukraine on Thursday, as President Vladimir Putin cast aside international condemnation and sanctions, warning other countries that any attempt to interfere would lead to “consequences you have never seen.” Big explosions were heard before dawn in Kyiv, Kharkiv, and Odesa as world leaders decried the start of a Russian invasion that could cause massive casualties and topple Ukraine’s democratically elected government, the AP reports. Ukrainian President Volodymyr Zelensky introduced martial law, saying Russia has targeted Ukraine’s military infrastructure and explosions are heard across the country. Zelensky said he had just talked to President Biden and the US was rallying international support for Ukraine. He urged Ukrainians to stay home and not to panic. More: