M-83A.

This is coolbert:

russian as spelled here with lower case letter r in a deliberate manner. Indicating a contempt for.

Chinese war munitions and weapon systems already reaching the Ukrainian Conflict? As promised by Xi and now given to Vlad.

​"Chinese-made Bombs Were Found on russian Troop’s Positions Captured by Ukraine’s Military
 (Video)"

From Defense Express ukr.defense.news September 17, 2022 and thanks to same.

"60mm M-83A mortar bomb found on russian troop’s position"

Projectiles as fired from mortars called "bomb" in all military other than USA. 

"This finding may indicate that the russian troops are forced to use Chinese ammunition due to the lack of their own"

"Warriors of the Armed Forces of Ukraine found Chinese-made mortar bombs at one of the positions left by the russian troops. These are 60mm munitions that are fairly easily identified as Chinese 60mm M-83A, a high-explosive (HE), fin stabilized, fragmentation mortar bombs."

No where can I find a reference that the Soviet/Russian army ever used a mortar of LESS than 82 mm caliber. The Russian traditionally enthralled by large sized mortars, the bigger the better. Mortars too cast-iron not rifled and firing a cast-iron bomb.

You CANNOT fire a 60 mm mortar bomb from a 82 mm tube? I guess that is correct but my knowledge is limited in this regard.

coolbert.