That’s exactly what’s happening. Here’s an excerpt from an interview with a Russian drone developer:

Well, that’s interesting because if you read the Western press, they often portray China as Russia’s main military ally, like they’re supplying everything needed for the front. Well, there’s China’s official stance and then there’s their unofficial stance. Officially, China says it follows all the sanctions and blocks military related exports. And in some areas, that’s true. For example, we can’t make payments to Chinese sellers using Russian bank cards anymore. A lot of products can’t be directly imported either. There are even decrees that ban the export of motors over 700 watt, which are exactly the kinds used in heavy drones. But then there’s the other side of the coin. We share a long land border with China, and there are countless private companies operating in that space. These companies handle transactions, organize shipments, and move parts across the border. And honestly, when you consider how tightly everything in China is monitored and regulated, it’s hard to believe that the government doesn’t know what’s going on.

https://youtu.be/RmfNUM2CbbM?t=819