Hah. Russia has so much leftover kit from Soviet times. They do not need Chinese weapons.
There might be purchases of Chinese equipment but it won't be weapons.
Russia would only need Chinese weapons in case of full on conflict with NATO.
If Russia needs military help, it is most probably in the area associated with major post-Soviet developemet, such as Micro-electronics for signal interception equipment for frequency agile signals, portable integrated mortar locating radar, as well as possibly processors behind jamming equipment.
Another possibility is smart munition.
However, I think the story is propaganda that seeks to enhance the impression of Russian desperation and blacken china’s name to prevent China from becomingr acceptable to the EU as mediator.