51.   Before the recent controversy, discussions on the prisoner exchange had been going nowhere for months.

52.   Both men were taken to Serbia and later freed in prisoner exchanges.

53.   Bosanac was later taken from the hospital and transferred to a Serbian prison, she said, and freed three weeks later in a prisoner exchange.

54.   Both sides met Sunday in the Chechen capital Grozny to break the military deadlock, which includes a stalled prisoner exchange, Interfax reported.

55.   But a few hours later, small-arms fire and three heavier explosions rocked the front lines near the site of the prisoner exchange.

56.   But each side accused the other of stalling on planned prisoner exchanges.

57.   But Khan said he would resume the attack if he was not satisfied with the pace of prisoner exchanges and return of the bodies of slain fighters.

58.   But the Bosnians say any prisoner exchange is meaningless without a Serb acknowledgment of responsibility for the fate of the missing.

59.   But, on Saturday, U.N. official Colum Murphy persuaded the Bosnian Serbs to drop a clause about prisoner exchanges opposed by the government.

60.   By severing contact with NATO, the Serbs have disrupted many plans, from negotiations on prisoner exchanges to the demarcation of buffer zones.