https://www.wsj.com/articles/proceed-with-caution-on-a-defense-pact-with-israel-11569538318
For all their longstanding defense ties, Israel and the U.S. have no mutual defense treaty. In the weeks before Israel’s Sept. 17 elections President Donald Trump and Prime Minister Benjamin Netanyahu both spoke favorably of negotiating one. Whether they were serious or simply wanted to bolster Mr. Netanyahu’s political support is unclear. In any case, a few observations are in order.
The U.S. is party to various kinds of defense treaties. The North Atlantic Treaty Organization is the most far-reaching. The treaty states that “an armed attack against one [ally] . . . shall be considered an attack against them all.” Other bilateral U.S. defense treaties create lesser obligations—to consult about threats, to recognize that an attack on one would endanger peace and safety of the other, to meet common dangers in accordance with one’s own constitutional processes.
American and Israeli officials have long refrained from negotiating a mutual defense treaty because it was judged unnecessary and potentially harmful to both countries. Israelis worried mainly about their own freedom of action; they didn’t want to have to ask U.S. permission before taking steps to defend their state. U.S. officials didn’t want to have to grant or deny such permission—or to “own” Israeli military operations.
Sometimes U.S. officials have been pleased when Israel took tough and risky military actions—against Iraq’s nuclear reactor in 1981, against terrorist leaders or operatives during the Second Intifada, and against Syria’s nuclear reactor in 2007. The U.S. could disavow any responsibility but, if the actions succeeded, benefit nonetheless.
In a crisis, the help the U.S. would give Israel (or Israel would give the U.S.) wouldn’t likely increase as a result of a mutual defense treaty. Historically, such assistance has been provided out of national interest, not legal obligation.