"We consider what has happened as an openly hostile act and a gross violation of international law by Washington," the foreign ministry in Moscow said in a statement.
"We call on the American authorities to come to their senses and immediately return the Russian diplomatic properties or all blame for the continuing degradation in our relations lies on the US."
Kremlin spokesman Dmitri Peskov for his part accused Washington of "trampling on international law".
US federal agents inspected a Russian trade mission in Washington to confirm its closure, a step that drew a fierce diplomatic protest yesterday from Moscow.
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The foreign ministry said today that the "US intelligence services with the support of armed police were now in charge of the seized buildings."
Washington issued the closure order Thursday in retaliation for Moscow ordering the US to slash its diplomatic mission by 755 personnel by September 1.
The recent surge in tensions between the two nuclear- armed powers is a diplomatic setback for US President Donald Trump.
During his campaign for office last year and in the early days of his presidency he promised to try to improve relations with Russian President Vladimir Putin.
Last year, tensions again escalated after US intelligence accused Putin of orchestrating a hacking and influence campaign to tip the presidential vote to Trump.
In the waning days of his tenure, president Barack Obama punished Russia by turfing out 35 diplomats and closing diplomatic compounds in New York and Maryland.
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