The United States is offering Russia a new military pact against ISIL and al-Qaeda in Syria, according to a leaked US proposal.

The United States is offering Russia a new military pact against ISIL and al-Qaeda in Syria, according to a leaked US proposal.

If finalized, the arrangement could dramatically alter America's role in the Arab country's five-year civil war.

The document published by The Washington Post calls for joint bombing operations, a command-and-control headquarters and other synchronized efforts. US and Russian officials with expertise in intelligence, targeting and air operations will "work together to defeat" the extremist groups, the eight-page paper states.

US Secretary of State John Kerry, who was to discuss the proposal in Russia's capital later Thursday, declined to comment.

"I'm going to Moscow, meeting with President (Vladimir) Putin tonight," Kerry told reporters in Paris. "We'll have plenty of time to talk about it and I'll give you all a sense of where we are."