Is World War III on the Horizon?

Saudi Arabia already has nukes, Iran probably does, and the Russians are one of the two great nuclear powers on the entire planet. 
So if Saudi Arabia, Turkey and their Sunni allies do decide to conduct a full-blown ground invasion of Syria, could someone ultimately decide to use nuclear weapons when their backs get pushed up against a wall?  As you read this article, there are thousands of military vehicles and hundreds of thousands of troops massed along the southern border of Turkey and the northern border of Saudi Arabia.  If the command is given and those forces start streaming toward Damascus, it is inevitable that the Syrians, the Iranians, Hezbollah and the Russians would fight back.  It would literally be the start of World War 3, and the Saudis and the Turks are trying very hard to convince the United States to be involved.  But the truth is that we don’t want any part of this conflict, because it could very easily become the very first nuclear war in the history of the Middle East.
In the event of a massive ground invasion by Saudi Arabia, Turkey and their allies, it is actually more likely that Russia may decide to be the first one to use nukes.  An invasion force of hundreds of thousands of troops would vastly outnumber the relatively small Russian force that is already inside Syria, and so the Russians may feel that the only way that they can keep the Sunni powers out of Damascus is to use tactical nukes.
Russia has more tactical nukes that anyone else in the world by far, and there are some reports that indicate that Russia may be prepared to use them in Syria.  For example, former Associated Press reporter Robert Parry, the author of America’s Stolen Narrative, says that a source has told him that the Russians have already warned Turkey that this could potentially happen…
If Turkey (with hundreds of thousands of troops massed near the Syrian border) and Saudi Arabia (with its sophisticated air force) follow through on threats and intervene militarily to save their rebel clients, who include Al Qaeda’s Nusra Front, from a powerful Russian-backed Syrian government offensive, then Russia will have to decide what to do to protect its 20,000 or so military personnel inside Syria.
A source close to Russian President Vladimir Putin told me that the Russians have warned Turkish President Recep Tayyip Erdogan that Moscow is prepared to use tactical nuclear weapons if necessary to save their troops in the face of a Turkish-Saudi onslaught. Since Turkey is a member of NATO, any such conflict could quickly escalate into a full-scale nuclear confrontation.
Given Erdogan’s megalomania or mental instability and the aggressiveness and inexperience of Saudi Prince Mohammad bin Salman (defense minister and son of King Salman), the only person who probably can stop a Turkish-Saudi invasion is President Obama. But I’m told that he has been unwilling to flatly prohibit such an intervention, though he has sought to calm Erdogan down and made clear that the U.S. military would not join the invasion.