The Russia-related questions on which President Trump urgently needs to shed some light seem to multiply by the day. The latest involve the president’s personal lawyer, Michael Cohen, and his work with an obscure Ukrainian opposition legislator and a Russian-born New Yorker who has done business deals with Mr. Trump. The three men produced a peace plan for Ukraine, which Mr. Cohen then delivered to the office of Michael Flynn, the national security adviser who was fired days later.

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