The U.S. Embassy in Russia is temporarily suspending processing non-immigrant visas applications in response to Russia’s expulsion of American diplomats.

Axar.az reports citing MoscowTimes that, “Due to the Russian government-imposed cap on U.S. diplomatic personnel in Russia, all non-immigrant visa operations across Russia will be suspended on Aug. 23,” the U.S. Embassy said in a statement published Monday morning.

“Operations will resume in Moscow on Sept. 1; visa operations at the U.S. consulates will remain suspended indefinitely,” the statement added.

Non-immigrant visas are issued to travelers who want to visit the U.S. temporarily, as opposed to applying for permanent residency in the country.

The move is just the latest in a series of tit-for-tat measures between Russia and the United States as part of an ongoing diplomatic spat over fresh sanctions codified by U.S. President Donald Trump on Aug. 2.

After the U.S. Congress overwhelmingly voted in favor of the sanctions bill, the Russian government announced on July 28 it would cut the number of U.S. diplomatic staff in Russia to 455.

Russia’s Foreign Ministry has also barred U.S. embassy staff access to a warehouse and recreational property in Moscow’s suburbs from the beginning of August.

“Russia’s decision to reduce the United States’ diplomatic presence here calls into question Russia’s seriousness about pursuing better relations,” reads the statement on the U.S. embassy page.