President Obama and Ukraine’s interim prime minister opened the door on Wednesday to a political solution that could lead to more autonomy for Crimea if Russian troops withdraw, as the United States embarked on a last-ditch diplomatic effort to defuse a crisis that reignited tensions between East and West. The tentative feeler came as Mr. Obama dispatched Secretary of State John Kerry to London to meet with his Russian counterpart on Friday, two days before a Russian-supported referendum in Crimea on whether to secede from Ukraine. Mr. Obama said the world would “completely reject” what he called a “slapdash election,” but added he still hoped for a peaceful settlement. In a show of solidarity for the […]