US closes embassy in Kyiv amid warnings of potential air attack

The US has closed its embassy in Kyiv due to warnings of a potential air attack. Officials received specific information about a possible strike, prompting the closure and advising US citizens in Ukraine to prepare for immediate shelter. The UK government is assessing its embassy's security but has not announced any closure plans. A cabinet minister described the situation as a "shocking escalation" by Vladimir Putin and emphasized the importance of taking the threat seriously. This development follows the US allowing Ukraine to use long-range missiles against targets in Russia. In response, Putin has adjusted Russia's nuclear weapon policy, lowering the threshold for potential use.