According to the Post, which cited sections of what it said was a draft agreement, United States and Russian commanders would set up a joint command and control centre to direct intensified air strikes against the groups. Prospects for such a deal are unclear.
U.S. Secretary of State John Kerry will visit Moscow this week to discuss Syria, Ukraine, Nagorno-Karabakh and other issues with Russian officials, State Department spokesman John Kirby said on Monday, Reuters reports.
Moscow and Washington brokered a landmark partial ceasefire in Syria in February, but it has since all but collapsed amid continued heavy fighting.
Even if the USA military does get dragged into cooperation, Pentagon officials told The Daily Beast that they'll push for as little information sharing as possible on target locations with the Russians. More cooperation with the USA could reinforce that narrative. Russia, a longtime backer of Assad, launched its own air campaign last September.
He and other U.S. officials have since played down this idea - reportedly a call for military strikes against the regime - but it is not clear if they have other options. But they have mostly tried to keep their distance and the coordination has been far from ideal.
Russian Federation has been a major ally of Assad while the United States, which backs rebels seeking to overthrow Assad, has called for him to leave power.
Russian Federation would be getting what it has wanted since intervening in Syria in late September: An global alliance of sorts. Moscow backs the government of Bashar al-Assad, while Washington leads an worldwide coalition against IS and lends support to Syrian rebels.
Efforts to bring an end to the war have taken on greater urgency since the emergence of ISIL, which seized control of large parts of Syria and neighbouring Iraq in mid-2014.
The Russian Foreign Ministry confirmed Kerry's visit to Moscow.
Meanwhile, President Obama has declared that Assad has lost all legitimacy and must go. Humanitarian aid deliveries to besieged, rebel-held areas are sporadic and grossly insufficient.
Kerry is expected to present Russian Federation with new proposals to create a joint intelligence group to share information on Jabhat al-Nusra and synchronize military strikes against the Islamic State, the newspaper wrote.
The document confirms and expands on details first reported by the Post last month about the Obama administration considering cooperating with Russian Federation in Syria to target al Nusra.