Moscow Mayor Sergei Sobyanin confirmed that a "counter-terrorist regime" has been declared in the city, according to a statement.

"The situation is difficult. In order to minimize risks, I, within the framework of the operational headquarters, decided to declare Monday a non-working day - with the exception of authorities and enterprises of a continuous cycle, the military-industrial complex, and city services," Sobyanin said on Telegram. "I ask you to refrain from traveling around the city as much as possible. It is possible that traffic will be blocked in certain areas and on certain roads."

According to Sobyanin, Moscow city services are on high alert.

Russian state media RIA Novosti reported Saturday that security measures are being strengthened at a number of places on the Moscow Ring Road. A checkpoint with a grenade launcher and an armored personnel carrier was installed at the exit from the Moscow Ring Road in the Yasenevo area and vehicles are being checked, according to RIA.

Earlier Saturday, the Russian National Anti-Terrorism Committee announced the introduction of a "counter-terrorist operation regime" in Moscow, as well as the Moscow region and Voronezh region.

The counter-terrorist regime includes, but is not limited to:

• document checks
• strengthened protection of public order
• monitoring telephone conversations
• restricting communications
• restricting the movement of vehicles and pedestrians on the streets.

The latest Wagner movements: Equipment of the Wagner private military company is moving across territory in the southern Russian region of Lipetsk, according to the region's governor, Igor Artamonov.

Lipetsk is the main city in the region of the same name, and it is about 470 kilometers (292 miles) south of Moscow.