A spokesman for Russian President Vladimir Putin said the country will likely take retaliatory measures against the United States.
"You realize, of course, reciprocal steps will be made and the U.S. embassy in Moscow and, quite possibly, the consulates will be cut down to size as well," Vladimir Dzhabarov, the deputy chairman of the foreign policy committee in the Russian Duma, told Tass News News Agency.
Two other individuals, Alekseyevich Belan and Evgeniy Bogachev, were sanctioned over unrelated crimes, including using cyber tools to misappropriate funds and personal information.
Ryan added that "Russia does not share America’s interests. In fact, it has consistently sought to undermine them, sowing dangerous instability around the world."
President-elect Trump has continued to deny Russian involvement in the election, treating any suggestion to that effect as an attack on the legitimacy of his forthcoming presidency.
Obama has similarly been under pressure to provide documentation backing up the intelligence community's claims that Russia was involved.
"If the CIA director, [John] Brennan, and others at the top are serious about turning over evidence … they should do that," Trump aide Kellyanne Conway said earlier this month. "They should not be leaking to the media. If there's evidence, let's see it."