Yanis Varoufakis, Greece’s combative finance minister, who took a strong stand in demanding that creditors write off some of his country’s debts, abruptly resigned on Monday morning.
Mr. Varoufakis had played a key role in rallying votes for a resounding “no” on a referendum on Sunday that asked Greeks whether they were willing to accept an arrangement with creditors that would require considerable further austerity, such as pension cuts. Mr. Varoufakis had threatened last week to resign if a “yes” vote passed, and his decision to resign after he and his allies prevailed in the referendum was unexpected.