"North Korea is believed to have several nuclear warheads that could be mounted on a missile" (FNC). However, it is not yet known if North Korea possesses the technology and knowledge required to mount the five to eight warheads on the missiles.
Although I said I thought Iran was more stable than North Korea in terms of using nuclear warheads against another country, I'm not sure if it counts if Iran is aiding North Korea. "Missile experts from Iran are in North Korea to help Pyongyang prepare for its rocket launch" (FNC). "Japan's Sankei Shimbun newspaper declared [Sunday] a 15-strong delegation from Tehran has been in the country advising the North Koreans since the beginning of March.
Pakistani Taliban leader Baitullah Mehsud "claimed responsibility Tuesday for a deadly assault on a Pakistani police academy and said the group was planning a terrorist attack on the U.S. capital" (FNC). Via phone, Mehsud told AP, "'Soon we will launch an attack on Washington that will amaze everyone in the world" (FNC). Mehsud also is undeterred by the $5 million bounty on his head. In fact, he wishes "'to die and embrace martyrdom'" (FNC).
It's a good thing we're not at war anymore. Otherwise, we'd probably have reason to worry about this!