Updated: 12/07/17 : 08:45:26Printable Version
Russia says it is "outrageous" that the US has not yet handed back two Russian intelligence compounds seized in the US under the Obama administration.
Foreign Minister Sergei Lavrov said he was "considering specific measures" in response, but did not elaborate.
Earlier, unnamed Russian officials said Moscow was ready to expel about 30 US diplomats and seize US state property.
In December the Obama administration expelled 35 Russian diplomats and shut down two intelligence compounds.
Ex-President Barack Obama acted against Russia after US intelligence sources had accused Russian state agents of hacking into Democratic Party computers to undermine Hillary Clinton's presidential campaign.
Mr Lavrov told Russian media it was "simply shameful for such a great country as the United States, a champion of international law, to leave the situation in such a state of suspended animation".
"Justice and international law must be restored," he said, accusing the US Congress of being "charged up with Russophobia"