61.   But Pakistan will be able to seize this moment only if it refrains from conducting a nuclear test, diplomats here said this week.

62.   But Pakistan responded quickly with matching nuclear tests.

63.   But the older guys will say that nothing can really replace a live nuclear test.

64.   But the prime minister, Nawaz Sharif, linked the decision to a lifting of sanctions imposed on both India and Pakistan after their nuclear tests in May.

65.   But the reason for the soaring tally lies not in global warming, ozone depletion or nuclear tests.

66.   But the very fact that old enemies are trying to make peace just nine months after tit-for-tat nuclear tests is extraordinary, officials say.

67.   But they could be distinguished by nuclear DNA tests.

68.   But U.S. officials said they believed other nations would take steps short of sanctions to make clear to India their displeasure with the nuclear tests.

69.   But was it a Russian nuclear test?

70.   By going ahead with the nuclear tests, Sharif turned his back on a broad package of U.S military and economic assistance Clinton had offered if Pakistan held off.