Israel–Syria relations refer to the bilateral ties between the State of Israel and the Syrian Arab Republic. The two countries have been locked in a perpetual war since the establishment of Israel in 1948, with their most significant and direct armed engagements being in the First Arab–Israeli War in 1948–1949, the Third Arab–Israeli War in 1967, and the Fourth Arab–Israeli War in 1973. Additionally, Israeli and Syrian forces also saw relatively extensive combat against each other during the Lebanese Civil War, the 1982 Lebanon War, as well as the War of Attrition. Both states have at times signed and held armistice agreements, although all efforts to achieve complete peace have been without success. Syria has never recognized Israel as a legitimate state and does not accept Israeli passports as legally valid for entry into Syrian territory; Israel likewise regards Syria as a hostile state and generally prohibits its citizens from travelling there, with some exceptions and special accommodations being made by both countries for Druze people residing in Syria and the Golan Heights (regarded by the United Nations as Syrian territory, occupied by Israel since 1967). Israel and Syria have never established formal diplomatic relations since the inception of both countries in the mid-20th century.