On Thursday Russian communications regulator Roskomnadzor formally asked the US search engine and social media giants to halt political advertising during the upcoming weekend of regional elections.
Several regional elections are set to be held on Sept. 8, meaning Sept.7-8 are designated political ad and campaign "silent days" in accord with Russian law.
Non-compliance will be viewed as meddling in Russia's sovereign affairs, according to a statement issued by Roskomnadzor.
Russia "will perceive this as interference into internal affairs, hostile influence to disrupt election and will have a right to act accordingly," the Russian media regulator and watchdog said.
The agency made the request Friday, and it follows a prior letter sent to Google in mid-August similarly warning election "interference" would not be tolerated. The prior letter came amidst a summer of widespread protests in Russia against corruption and the ruling United Russia party.