The U.S. State Department is urging Americans to leave Russia immediately, warning of potential harassment by Russian security officials and of possible issues with accessing money within the country.
Also on Saturday, Russian President Vladimir Putin denied reports that he will impose martial law in Russia.
Separately, he warned that he would consider any third parties that declare a no-fly zone over Ukraine to be participants in the conflict.
Earlier in the day, Ukraine's deputy prime minister said Russia violated a cease-fire agreement and that attacks are ongoing in the cities of Mariupol and Volnovakha. Russia and Ukraine had agreed to the temporary cease-fire in the two cities to enable civilians to leave safely.
Russian and Ukrainian officials are expected to hold a third round of talks on Monday, according to Ukrainian negotiator David Arakhamia. The Kremlin has not yet confirmed such a meeting.