The state of Russia’s three-year war against Ukraine remained deeply unsettled Sunday, with the U.S. saying it does not know whether peace is possible while European leaders met in London to voice their ongoing support for Kyiv’s forces. The new developments came two days after Friday’s explosive Washington meeting between U.S. President Donald Trump and Ukrainian President Volodymyr Zelenskyy that devolved into an intense confrontation as the U.S. leader ordered his counterpart to leave the White House and a prospective U.S.-Ukraine rare earth minerals deal was left unsigned. “We need a very radical reset,” Lord Peter Mandelson, the British ambassador