DPRK and Pakistan we trust with nuclear weapons but not Iran? Oookay.
Does Pakistan supply weapons to designated terrorists groups ?
Do you ever think to google things before speaking?
"Pakistan, which has nuclear weapons, only sponsors smallish terrorist groups supporting the Taliban or the fighters in Kashmir, neither of whom could serve their purpose by using a nuclear weapon."
Terrorists with nuclear weapons
"Numerous U.S. officials have also accused the ISI of supporting terrorist groups, even as the Pakistani government seeks increased aid from Washington with assurances of fighting militants. In a May 2009 interview with CBS' 60 Minutes, U.S. Defense Secretary Robert Gates said "to a certain extent, they play both sides." Gates and others suggest the ISI maintains links with groups like the Afghan Taliban as a "strategic hedge" to help Islamabad gain influence in Kabul once U.S. troops exit the region. These allegations surfaced yet again in July 2010 when WikiLeaks.org made public (NYT) a trove of U.S. intelligence records on the war in Afghanistan. The documents described ISI's links to militant groups fighting U.S. and international forces in Afghanistan. In April 2011 during a visit to Pakistan, U.S. Chairman of the Joint Chiefs of Staff Admiral Mike Mullen pointed to ISI's links with one such group, the Haqqani network. The May 1, 2011, killing of America's most wanted terrorist Osama bin Laden in a Pakistani military town not far from Islamabad raised new questions over army and ISI support for the al-Qaeda leader and the legitimacy of their counterterrorism efforts. Pakistan's government has repeatedly denied allegations of supporting terrorism, citing as evidence its cooperation in the U.S.-led battle against extremists in which it has taken significant losses both politically and on the battlefield."
http://www.cfr.org/pakistan/isi-terrorism-behind-accusations/p11644