1) If you want to know whether this patent is valid in China, you need to check whether this patent has been filed in China. This can be done by looking at the European Patent Office to see if all the cognates of this foreign patent are in China, i.e. the document name starts with CN plus a bunch of numbers. If there is, and then through the China Intellectual Property Office or other domestic patent search engine to find this CN documents, you can learn the legal status of whether the authorization, whether it is valid and so on.

2) also as above, in the European Patent Office to check the foreign patent family, if there is a WO beginning with a bunch of numbers, is in the pct application.

But my method may be stupid and a bit troublesome, others may have an easier way