What if my passport is stamped with a black stamp in Moscow?

I don't quite understand your question. What if the passport is stamped with a black stamp? Congratulations, you can go back to China and never go back to Moscow, because Moscow doesn't believe in tears. If so, how can I stamp your passport with a black stamp? There are many ways to do this. The most environmentally friendly way is not to extend your passport after it expires, but it will take about three months. At this time, when you report to the Immigration Bureau, the immigration official asks you why your passport is not extended, and you say that you don't want to extend it and want your passport to expire. That's enough. When you finish, you will see a black seal on your passport.