The US doesn't have the money nor troops for a regional war in the Middle East. Syria and Iran have a mutual defense agreement because after Iraq, both countries know either one is next on the Israel's war agenda. Israel has less than a decade of hegemony left, hence the urgency to attack now. It's already too late and time for plan B - peace agreements!
Turkish police fire tear gas as clashes break out during May Day protest in Istanbul (Reuters)
from the article: Assad: Israel leading the Middle East to war