Are the U.S., Russia, NATO and Iran in a quagmire in Syria?

Yes. The Short answer is: "Yes". The country in the worst shape right now likely is Russia in all this. The second most in bad shape is Iran. NATO and the U.S. are sort of staying back as far as they usefully can except for the 50 Special OPs Forces to be deployed training fighters to fight ISIS in Northern Syria. However, I think in the end this is more political than anything else to give us leverage to eventually oust Assad from Syria. This is my thought why we are deploying only 50 Special ops forces into Syria to train Moderates to fight ISIS.

But, Russia is in the biggest danger because it went in with all guns blazing so to speak which is more like the old "Cowboy" Stance of the U.S. up through World War II before the Cold War than anything else.

However, in todays world it plays good on the news still but isn't very effective with what is presently going on in Syria.

So, likely Turkey, Saudi Arabia and other Sunni nations likely are going to Aid Syria moderate rebels with many weapons to really put Russia into a real quagmire there. This is the most likely outcome there in Syria.

Where is Iran in all this? They need to get rid of ISIS so they don't make inroads into Iran or further into Syria where they have another Shiite government in Assad. So, Iran now has three governments in it's pocket: Syria, Iraq and IRan. But, that's all. So, they are likely willing to expend any amount of money whether they can afford it or not, to keep Assad in power.

So, the three nations in the deepest quagmire after all this are: Russia, Iran, Syria.