A mutual defense treaty between the US and Israel would give Israel the ability to commit the US to a war in Israel's behalf.
Remember history. It was British prime minister Chamberlain's guarantee to Poland that started World War II. The idiot British lost control over their own policy and gave it to a crazed and irresponsible Polish military dictatorship.
The attack on the Saudi oil fields that Trump and Israel are blaming on Iran is almost certainly an attack by Israel. The attack is being used to start a war with Iran.
Putin needs to speak up now before the war starts, because it is impossible that Russia will be able to avoid involvement. The chances are substantial that Armegeddon is about to unfold while the world sits stupidly.