Is it infringement that domestic patent is copied by foreign countries?

No, patents are regional and temporal, unless the infringement of foreigners takes place in China. It is irrelevant that applying for a domestic patent can be protected at home and applying for a foreign patent can be protected in the applicant country. For example, you apply for a domestic patent first, then submit the PCT, and then you can specify the country you want to enter. Patent is the principle of request, you don't ask who gives you the right? Therefore, in which country you need protection, enter that country.