Russia’s Foreign Ministry said that it has ordered some U.S. Embassy staff to leave Moscow amid a diplomatic spat between the two countries, Reuters reported.

Russian Foreign Ministry spokesperson Maria Zakharova said at a press briefing that U.S. Embassy staffers who have been in Moscow for more than three years will have until Jan. 31 to fly back home.

The move comes after Russia’s ambassador to the U.S. said last week that 27 diplomats and their families were expelled from the U.S. and would leave on Jan. 30, according to Reuters.

Zakharova said that Russian diplomats who were forced to leave have also been banned from working as diplomats in the U.S. for three years, according to a Russian state news agency.