CNN  —  The United Nations has accused Israel of “severe violations” of a 50-year-old agreement with Syria, saying it has engaged in “engineering groundwork activities” that encroach on a key buffer zone in the Golan Heights. “Violations of the 1974 Disengagement Agreement have occurred where engineering works have encroached into the AoS (the area of separation),” the UN Disengagement Observer Force (UNDOF), which has maintained the ceasefire between Israel and Syria since 1974, said in a