PAKISTAN, perhaps or...Some of "non-existent" SADDAM'S (Via SYRIA) maybe RUSSIA too...
I remember General LEBED in 1998 denounced the theft of some 20 "suitcase nukes" to the Kommissja Oboroni (Defense Commission) of Russian DUMA (Parliament).
A FORTHNIGHT LATER HE DIED IN CURIOUS HELICOPTER INCIDENT....
I was trying to remember who lost all those nukes... Thanks!
Those would be my first and 2nd guesses as well, with China being a distant 3rd.