The acting U.S. ambassador to Ukraine, Kristina Kvien, speaks to media in Lviv, Ukraine, on Tuesday. The U.S. has relocated the embassy from the capital Kyiv to the western city of Lviv, citing the buildup of Russian forces on Ukraine's borders. An estimated 20,000 or more Americans have been living in Ukraine. Many have left, but some say they'll remain even if war breaks out. (AP)
