U.S. Vice President Joe Biden, on a last foreign trip before leaving office, has met with Ukraine’s president and called on the impending Donald Trump administration to retain Ukraine-related sanctions against Russia. Biden’s comments Monday at a briefing with President Petro Poroshenko came after Trump indicated in a Times of London interview that he could end sanctions imposed in the aftermath Russia’s 2014 annexation of Crimea in return for a nuclear arms reduction deal.