How to save Pakistan's nuke from terrorists?

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The world is in danger today because of the terrorists in Pakistan is getting stronger. The problem is amplified the civilian support that these terrorists are getting. What if they got hold of the nuke. The India, US and Israel will be the obvious targets. Though all of them are equipped with anti missile and nuclear power themselves. The US bases in Afghanistan and nearby area will be in danger. So, what should the world do to stop terrorists. Should not the collective force of the world is needed?