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"Joseph Biden, welcome to Kyiv!" Ukrainian President Volodymyr Zelenskky wrote on his official Telegram channel. "Your visit is an extremely important sign of support for all Ukrainians."
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The visit was kept secret because of security concerns. It was also symbolic because it comes as Ukraine has been intensely lobbying the U.S. for more weapons to help it fight back against Russia's aggressions as the war enters an uncertain new phase.
There are few, if any, examples of U.S. presidents traveling to an active war zone where there is no U.S. troop presence.