President Joe Biden, in Poland after his lightning trip to Ukraine, declared Tuesday the U.S. and it's allies will "not tire" of supporting Ukraine. "One year, one year into this war, Putin no longer doubts the strength of our coalition, but he still doubts our conviction," Biden said in a speech at the Polish castle where he spoke shortly after the Russian invasion of Ukraine last year. "But there should be no doubt, our support for Ukraine will not waver. NATO will not be divided and we will not tire," he added. Biden's speech came one day after his daring, unannounced trip to Kyiv, where he met with Ukrainian President Volodymyr Zelenskyy.