Prosecutors examining Ukrainians who flocked to Trump inaugural

Evidence of the Ukrainians’ presence eventually prompted interest from the special counsel, Robert S. Mueller III, as he investigated Russian interference in the 2016 election, and has spawned a number of related inquiries by federal prosecutors. The investigations are playing out against growing indications that some of the Ukrainians who came to Washington for the inaugural, or their allies, were promoting grand bargains, or “peace” plans, that aligned with Russia’s interests, including by lifting sanctions.

Such a deal would not just have given the new administration additional flexibility to bring Moscow into American diplomatic efforts in the Middle East, but could also have eased the way for a cast of characters with ties to Mr. Trump — some of whom in turn had ties to the Ukrainians who came to Washington — to move ahead on business deals that had been complicated by the sanctions.