This is reported by the Center for Combating Disinformation. In particular, 

• K. Ivashchenko, a collaborator-“leader” of the temporarily occupied Mariupol, stated: “the environmental situation in Mariupol has improved recently, since metallurgical enterprises are not working in the city at the moment, all the conversations of the Ukrainian mass media about the disaster are fiction.”
• The following disinformation: the Ministry of Defense of the Russian Federation, referring to the testimony of captured servicemen of the Armed Forces, reported that “a large number of mobilized Ukrainian citizens have health restrictions, but they are forced to sign a refusal to pass a special medical commission at the military commissions.”

• Also, the Russian mass media reported with reference to the Ministry of Defense of the Russian Federation: “200 militants of the Kraken formation refused to comply with the command’s order to advance to the Kramatorsk district. The militants declared a “transition” to the Kharkiv city police, and during the fight with the commanders and the firefight that began, six people were killed.”