Although the total number of nuclear weapons in the Chinese arsenal is unknown, as of 200 estimates vary from as low as 80 to as high as 2000. Nobody really knows because of the strict secrecy of the PLA.
http://www.wired.com/politics/security/magazine/17-10/mf_deadhand?currentPage=all
Inside the Apocalyptic Soviet Doomsday Machine
We also do not know much about Russia’s new nuclear weapons. We only know about those that existed in 1992. Newer strategic nukes and tactical nukes (numbers therof) are still considered state secrets of Russia.