Hamas released propaganda videos Monday showing six Israeli hostages who were recently executed, in what appears to be an effort to increase domestic pressure within Israel and gain leverage in ongoing ceasefire negotiations. The videos call for a ceasefire and a hostage-for-prisoner exchange, and a Hebrew graphic asserts that the release of living hostages can only be achieved through negotiations, not military action. Read: US And Syrian Forces Capture ISIS Leader, Pursue Escaped Fighters This propaganda is part of a broader Hamas strategy to weaken Israeli public support for the military op…