As The Times reports about the drones shot down in Poland:

The Shahed 136 — or Geran 2 in Russian — has become the most frequently used in the Ukraine war. Russia has begun mass producing them on their own soil.

The plant in Alabuga in the Tatarstan region of Russia, is staffed primarily with migrant labour, some of which is from Africa. Japanese media also reported that the supreme leader of North Korea, Kim Jong-un, is to send 25,000 workers there.

Not everything is made in Russia. The four-cylinder engine is made by a Chinese company, Xiamen Limbach, while the high-tech parts of the drone — the signal generators and converters — are manufactured by the Beijing Microelectronics Technology Institute.

The four-cylinder engine is made by a Chinese company, Xiamen Limbach

…which was a German company bought by the Chinese in 2011.

It was and is a problem to carelessly have sold so much industry to them.

Looking briefly, it appears the current owner basically bought the company out of bankruptcy. It doesn’t appear that the motors are particularly novel.

The owner is a dual German/Chinese national, be was done so at a time of amicable relations. Even today such a sale would (IMHO) likely not be seen as geopolitically significant.