By Kevin Liptak, CNN (CNN) — President Joe Biden slipped into Kyiv on Monday for the first time since Russia launched a full-scale invasion of Ukraine almost a year ago, demonstrating in dramatic personal fashion his commitment to the country and its struggle as the war enters an uncertain new phase. The highly secretive visit — which took place as air raid sirens could be heard ringing out around Kyiv while Biden walked alongside President Volodymyr Zelensky around the gold-domed St. Michael’s Cathedral — comes at a critical moment in the 12-month conflict, with Russia preparing for an expected spring…
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