Z-visas in Russia

Hello Sir,
I am a Russian / American citizen residing in Russia right now. My employer in China can obtain an invitation "PU" letter for me (as an American citizen) addressed to the Chinese Consulate located in Russia. Are Consulates in Russia issuing Z-visas right now? What are the procedures to apply here in Russia? COVA (Chinese On-line Visa App) is greyed-out for all Russian Consulates so it is impossible to submit an application through it. Thank you for the info.