Michael D. Cohen, second from left, Mr. Trump’s personal lawyer, with Michael T. Flynn, left, and former Gov. Rick Perry of Texas at Trump Tower in December. Mr. Cohen delivered the peace plan to Mr. Flynn a week before Mr. Flynn resigned as national security adviser.
Credit: Sam Hodgson/ The New York Times

A week before Michael T. Flynn resigned as national security adviser, a sealed proposal was hand-delivered to his office, outlining a way for President Trump to lift sanctions against Russia.

Mr. Flynn is gone, having been caught lying about his own discussion of sanctions with the Russian ambassador. But the proposal, a peace plan for Ukraine and Russia, remains, along with those pushing it: Michael D. Cohen, the president’s personal lawyer, who delivered the document; Felix H. Sater, a business associate who helped Mr. Trump scout deals in Russia; and a Ukrainian lawmaker trying to rise in a political opposition movement shaped in part by Mr. Trump’s former campaign manager Paul D. Manafort.

At a time when Mr. Trump’s ties to […]