Там буквально написано:
The United States government had pressured the Israeli government to release these prisoners because the Palestinian Authority had made their release a condition to resuming peace talks. The Israeli government, which had agreed to peace talks with no preconditions, submitted to the Palestinian precondition, and talks are now likely to go forward.

http://matzav.com/analysis-united-states-presses-israel-to-release-murderers-but-won%E2%80%99t-release-pollard