China is estimated to have approximately 100 nuclear warheads and delivery systems that can reach the continental United States, anything over that would not make much sense anyway. Smaller is a relative term, in absolute terms this is a devastatingly powerful set of weapons.

China has a more powerful military than Russia at this point and vastly superior manufacturing and economic means to sustain it and push further. China's nuclear arsenal is merely smaller, but so what, nobody needs 10,000 nukes anyway. A thousand well-aimed nukes will do the job.