Both the United States and Russian Federation have aircraft that conduct operations over Syria, and a draft of the proposed agreement, a copy of which was obtained by CNN, would allow for targeting and carrying out joint air strikes against ISIS and al-Nusra, the al Qaeda branch in Syria.
Ahead of the meeting in Moscow, there appeared little indication that Assad was set to budge on the major issue hampering peace talks - his own future.
Significantly Mr Kerry did not deny the idea and his office said there could be no comment until after his meeting with Russian president Vladimir Putin.
"But it can not be at the cost of keeping Bashar al-Assad in power and it can not be with the Russians continuing to attack the moderate Syrian opposition".
Rogin concludes. "While Jabhat al-Nusra is a problem, teaming up with the Russian air force might not be the best solution".
U.S. Secretary of State John Kerry has condemned the "incredible carnage" in the attack in Nice, France, and said that Syria is now the world's foremost "hotbed for terrorists". "It's not clear that we'll ever reach an agreement".
The U.S. still wants to see Assad encouraged to leave, although U.S. officials can't really say how that is more than a hope.
"Only the Syrian people define who is going to the president", he said.
According to the Post, Kerry was to propose to Putin that Russian Federation and the United States set up a "Joint Implementation Group" or JIG to "enable extended coordination" between their militaries on the Syrian battlefields.
But, while the Islamic State's so-called "caliphate" has global ambitions, Al-Nusra - an affiliate of Al-Qaeda - has concentrated on battling Assad, fighting alongside other rebel groups backed by USA allies.
The Obama administration has few alternatives to working with Russian Federation.
Suggestions of USA force don't carry much weight, given the unfulfilled threats throughout the war.
The proposed U.S. -Russian "Joint Implementation Group" would be based near Amman, Jordan.
Syria s conflict began in 2011 with the repression of anti-government demonstrations and has evolved into a multi-front war that has left more than 280,000 dead and forced millions from their homes. Nusra's fighters are often embedded with such groups on the battlefield or move between various militant formations. The plan also includes coordinated air strikes on the Islamic State and the Al Nusra Front.
The nuclear powered aircraft carrier USS Harry S. Truman arrives at in Norfolk, Virginia, US, after supporting missions in Iraq and Syria. He said his group would continue fighting alongside Nusra. Al-Saloum, the group's spokesman, demanded "an immediate transitional period".