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The Syria peace talks that were supposed to start Monday will almost certainly be put off as major powers squabble over who among the Syrian opposition should and should not attend.

It鈥檚 hardly a promising start for a 鈥減rocess,鈥� as Secretary of State John Kerry calls the discussions, which are supposed to lead to a cease-fire, a political transition, and an end to Syria鈥檚 devastating 5-year-old civil war.

The inability to get the long-planned talks off the ground as scheduled amid heated disputes over the guest list is a stark reminder that Syria鈥檚 is no average civil war. Instead, it is a complex proxy war pitting regional powers against one another and serving as an arena where world powers, chief among them the United States and Russia, are employing their militaries with differing, if not opposing, ends.

And at the moment, it is Russia and its ally, the regime of Syrian President Bashar al-Assad, that appear to have the upper hand.

A year ago, the US was still insisting that any resolution of the Syrian conflict would have to include Mr. Assad鈥檚 departure. But the US and its Western partners have moderated such demands as more than three months of Russia鈥檚 military intervention in Syria have reinforced Assad. He has increasingly become the 鈥渉old your nose and accept鈥� option in terms of making headway on America鈥檚 No. 1 priority 鈥� defeating the Islamic State extremist organization.

鈥淚 see the slope leading us into the arms of Assad,鈥� says one European diplomat, who spoke on condition of anonymity, 鈥渂ut I don鈥檛 see the alternative to this slope.鈥�

Both the US and Russia are adamant that the talks proceed, but for different reasons. Russia sees the talks bolstering the Assad regime鈥檚 hold on power. For the US, the most pressing concern has shifted from 鈥淎ssad must go鈥� to ending the fighting, alleviating Syria鈥檚 humanitarian crisis, and allowing a shift of energies to defeat the Islamic State.

Beyond the threat that deteriorating conditions inside Syria pose to millions of civilians, the humanitarian crisis, along with the instability it foments, serves the purposes of the Islamic State. And it feeds the migration crisis turning Europe upside down.

By Friday Secretary Kerry, attending the annual World Economic Forum in Davos, Switzerland, was insisting that any delay in the talks would be limited to a 鈥渄ay or two.鈥� His Russian counterpart, Sergey Lavrov, said earlier in the week that the talks would 鈥渄efinitely not鈥� be put off to February.

But disputes remain over what opposition groups should be allowed inside the tent. Everyone agrees that the most extreme Islamist groups, including the Al Qaeda-affiliated Nusra Front, will not attend. Beyond that, lists of participants diverge.

Saudi Arabia is insisting on inviting some radical Sunni opposition groups that Russia doesn鈥檛 want 鈥� their presence is opposed by Assad, who views them as 鈥渢errorists.鈥� On the other hand, Russia does want the door open to Kurdish fighters that Turkey wants out of the picture and that Saudi Arabia would exclude as mere extensions of the Assad regime.

Kerry was scheduled to fly to Saudi Arabia over the weekend to try to keep the talks on track.

Another factor is Iran, which is emerging from years of diplomatic ostracism as a result of the recently implemented deal involving its nuclear program. The Obama administration had posited during the nuclear negotiations that a post-deal Iran might be more cooperative on international issues, but some Iran specialists say that, on the contrary, the country is likely to act more assertively in the region.

In terms of Syria, this could mean that Iran will act more aggressively to help ally Assad consolidate his hold on power before any cease-fire is declared.