MOSCOW — Russia took its first steps on Friday to retaliate against proposed American sanctions for Moscow’s suspected meddling in the 2016 election, seizing two American diplomatic properties in Russia and ordering the United States Embassy to reduce staff by September.

The moves, which had been threatened for weeks, came a day after the United States Senate approved a measure to expand economic sanctions against Russia, as well as against Iran and North Korea. The White House announced late Friday that President Trump would sign the bill.

The latest move by the Kremlin strikes another blow against the already dismal diplomatic relations between the two sides, with each new step moving Moscow and Washington further from the rapprochement anticipated a few months ago.

“Russia’s response to the new sanctions was inevitable,” Aleksei Pushkov, a Russian legislator and frequent commentator on international affairs, wrote Friday on Twitter. “There is a high probability that this will not be the end of it.”