Will additional sanctions on Iran mean that Iran will launch even more attacks against Saudi Arabia, since they did it because of sanctions?
Iran did not attack Saudi Arabia after signing a nuclear deal with the West but only did it after Trump withdrew from the deal, and imposed a maximum pressure campaign of sanctions that threatens to bankrupt the country economically.
Trump cornered a dog against the war, and he is now provoking the cornered dog further. He thinks it will not bite back!
Against the wall, i.e.