There are varying assessments on the factors that might trigger a large scale conflagration in the Middle East. There are those who believe that this major outbreak of hostilities may occur in May, when President Trump makes a final decision on the Iranian nuclear deal. Some argue that the overwhelming Iranian pressure on the borders of the Zionist entity from Syria and Lebanon will be the immediate factor behind an escalation. Israel has stated that it will not put up with the reality which Iran seeks to impose, such as establishing bases in southern Syria. Finally, some argue that the outbreak will be the result of Russia-US rivalry over Syria.
US-Russia sparring match
Preventing the war is an onus to be borne both by Russia and the United States.