From a story on axios.com by Ivana Saric headlined “How Biden secretly visited Ukraine”:

President Biden arrived back in Poland on Monday evening following a roughly five-hour surprise visit to Kyiv ahead of the one-year anniversary of the war.

Why it matters: While American presidents have visited war zones before, Biden’s visit to Ukraine was “historic and unprecedented” the White House said, as there has never been a visit by a president to an active war zone where the U.S. does not have a military presence.

Now that Biden has left the country, new details on how Biden made his way to the Ukrainian capital are being reported.