81.   They were believed to be working out the details of the nuclear deal.

82.   U.S. confident fuel commitments to North Korea will be met in nuclear deal.

83.   U.S. officials contend Iran could use material and know-how from the Russian nuclear deal to build nuclear weapons.

84.   U.S. officials held out little hope that Russia would cancel a disputed nuclear deal with Iran or halt its crackdown in Chechnya.

85.   U.S. officials say this is necessary for implementation of the nuclear deal.

86.   U.S. and South Korean officials have been cautiously optimistic that the North eventually will honor the nuclear deal because it has so much to gain.

87.   Washington and Seoul canceled the annual joint military exercise last year to persuade the North to sign the nuclear deal.

88.   Under a landmark nuclear deal signed last October with Washington, North Korea agreed to open talks with the South, but relations between the two Koreas remain tense.

89.   Washington and Pyongyang are required to ease trade and other economic restrictions within three months from the date the nuclear deal was signed.

90.   When the U.S. was pushing North Korea for a nuclear deal, one was right off their shores.