The United States is offering Russia a new military pact against the Islamic State group and al-Qaida in Syria, according to a leaked U.S. 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. U.S. and Russian officials with expertise in intelligence, targeting and air operations will “work together to defeat” the extremist groups, the eight-page paper states.

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