"The trend is now that there is less Western-made components but more – not hard (to) guess which country – made components.
China has repeatedly denied sending military equipment to Russia since Moscow's all-out invasion of Ukraine in February 2022.
The assault triggered Western sanctions, including on sending military and dual-use technology such as microchips that could be used in either ordinary appliances or weapons.
The experts also reported finding Chinese parts in the fire control system in Russian tanks that had earlier used French-made parts.
Ukraine has imposed sanctions on the Chinese company Comnav Technology for supplying navigation and radar equipment to Russia that could be used to support Russian and Iranian drones and missiles.