Russia is not a party to the conflict in Donbas. Russia is not involved in the fighting.
Recurring pro-Kremlin disinformation on war in Ukraine. euvsdisinfo.eu/disinformation-cases/?text=&disinfo_issue=&disinfo_keywords%5B%5D=77110&date=,
The Office of the Prosecutor of the International Criminal Court has stated that “the information available suggests that the situation within the territory of Crimea and Sevastopol amounts to an international armed conflict between Ukraine and the Russian Federation. This international armed conflict began at the latest on 26 February when the Russian Federation deployed members of its armed forces to gain control over parts of the Ukrainian territory without the consent of the Ukrainian Government https://www.icc-cpi.int/iccdocs/otp/161114-otp-rep-PE_ENG.pdf
For further debunking see https://euvsdisinfo.eu/report/the-osce-the-pentagon-nato-headquarters-and-the-council-of-europe-do-not-recognize-the-facts-of-russias-aggression-against-ukraine-primarily-the-intrusion-of-russian-tanks-and-paratroopers-into-do/