As for China, they have no problem producing either, and they already have a good stock of Hydrogen bombs (Fission-fusion) and A-bombs (Fission)
Yes. They are hiding their nukes in underground tunnels. More than 3,000 nukes are similarly hidden in China.
China 'hiding up to 3,000 nuclear warheads in secret tunnels'
http://www.telegraph.co.uk/news/worldnews/asia/china/8927580/China-hiding-up-to-3000-nuclear-warheads-in-secret-tunnels.html
But their missiles are not as good as the Russian / American ones and they don't have advanced submarines which are capable of launching SLBMs.
Countries like Israel should also be encouraged to to disclose their number of nuclear weapons, aswell as signing up for the NPT. No doubt most countries overestimate their number of nukes, partly because its become a global dick waving contest.
Bah, they can simply make up a number, and release photoshopped images of them. Done, no proof needed, just a big fake dick, lol.
lol, at least Israel can make decent photoshop propaganda compared to the shoddy attempts by Iran and North Korea:
NK:
Iran (top pic is a stock photo
):