Roughly 60% of the foreign parts found in Russian weapons on the battlefield in Ukraine come via China, Ukraine's presidential adviser Vladyslav Vlasiuk told reporters on Tuesday, Paralel.Az reports citing Reuters.

"If you take all the usual types of weapons and count the foreign made components – about 60% would be coming from China. We have had lengthy discussions with some manufacturers about this," Vlasiuk said.

"The PRC (China) is the biggest problem I would say."

He said important parts used in surveillance, drones and missiles have also originated from the United States, the Netherlands, Japan and Switzerland among other western countries.