Joe Biden
On February 20, 2023, four days before the one-year anniversary of the start of Russia's invasion of Ukraine, Biden visited Kyiv and met with President Volodymyr Zelenskyy and First Lady Olena Zelenska. While there, Biden promised more military aid to Ukraine and criticized Vladimir Putin. The trip was unannounced and many people were surprised. Biden became the first sitting U.S. President to go to an active war zone not controlled by the American military since 1864. The last time was Abraham Lincoln during the Civil War.