On Wednesday, U.S. officials broke into the residence of Russia's Seattle consul, forcing open the lock on the door.

Moscow is demanding that the United States return the six diplomatic properties it has seized, Russia's Foreign Ministry Spokesperson Maria Zakharova has said.

"We insist on the return of all six facilities of Russian property seized by the United States," Zakharova said Thursday. "We expect that the global community will pay attention to this actual state robbery to which the U.S. authorities have downgraded themselves."

The diplomat said that Russian officials are not even allowed to enter the facilities in order to check the utility systems.

On Wednesday, U.S. officials broke into the residence of Russia's Seattle consul, forcing open the lock on the door. The Russian Embassy called it an "invasion," emphasizing that Russia owns the building.

"The situation is absolutely outrageous, disgusting and unprecedented. Nothing like this has ever happened in the history of bilateral relations," Zakharova said.

"Certainly, this is a gross violation by the United States of basic international rules of law, including those documented in the 1961 Vienna Convention on Diplomatic Relations, the 1963 Vienna Convention on Consular Relations and the bilateral consular convention of 1964."

Last month, U.S. President Donald Trump announced that the diplomatic consulate in Seattle would be closed, and 60 Russian diplomats expelled in response to Russia's alleged role in a nerve agent attack against a former spy in Britain.

The move has been part of the past year's saga of rising tensions between the United States and Russia.

In September of last year, the Trump administration closed and seized the Russian consulate in San Francisco, along with its trade mission in Washington and New York.