U.S.-Russia Call's Leak Raises Global Question: Who Did It?

A leaked telephone conversation between U.S. special envoy Steve Witkoff and a top Russian official over how to get their respective bosses to revive a moribund Ukraine peace process sparked a global game of Clue: Who has the capacity to eavesdrop on a cellphone chat between top Russian and American officials? And who would benefit the most from leaking the conversation?

- BY DAVID LUHNOW AND THOMAS GROVE

U.S. special envoy Steve Witkoff, one party to the conversation.