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 Russia, and the people connected to him, are under heightened scrutiny — with investigations by American intelligence agencies, the F.B.I. and Congress — some of his associates remain willing and eager to wade into Russia-related efforts behind the scenes.
But the proposal contains more than just a peace plan.
Andrii V. Artemenko, the Ukrainian lawmaker, who sees himself as a Trump-style leader of a future Ukraine, claims to have evidence — “names of companies, wire transfers” — showing corruption by the Ukrainian president, Petro O. Poroshenko, that could help oust him. And Mr. Artemenko said he had received encouragement for his plans from top aides to Mr. Putin.