U.S. President Donald Trump accused China of seeking to meddle in the Nov. 6 U.S. congressional elections on Wednesday, saying Beijing did not want his Republican Party to do well because of his stance on trade.

Russia’s prime minister sternly warned the United States on Friday against ramping up sanctions, saying that Moscow will retaliate with economic, political and unspecified “other” means.

The Russian leader didn’t address allegations that government-sponsored Russian hackers have meddled in the U.S. 2016 presidential elections.