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				"The Russians and Iranians would be making a grave humanitarian 
				mistake to take part in this potential human tragedy. Hundreds 
				of thousands of people could be killed. Don’t let that happen!" 
				Trump wrote in a tweet.
 A source has told Reuters that Assad is preparing a phased 
				offensive to regain Idlib.
 
 The northern province and surrounding areas are the last major 
				enclave held by insurgents fighting Assad, who has been backed 
				by both Russian and Iranian forces in Syria's seven-year-old 
				civil war. They are home to some three million civilians.
 
 Trump has sought better relations with Russia since taking 
				office in 2017 but the United States has been unable to rein in 
				Moscow's military and diplomatic support for Assad.
 
 U.S. Secretary of State Mike Pompeo on Friday said Washington 
				views any government assault on Idlib as an escalation of 
				Syria's war, and the State Department warned that Washington 
				would respond to any chemical attack by Damascus.
 
 Nikki Haley, the U.S. ambassador to the United Nations, wrote on 
				Twitter late on Monday: "All eyes on the actions of Assad, 
				Russia, and Iran in Idlib. #NoChemicalWeapons"
 
 Iran called for militants to be “cleaned out” of Idlib, as it 
				prepared for talks with Syria and Russia about confronting the 
				last major enclave held by rebels opposed to Assad.
 
 Iranian Foreign Minister Mohammad Javad Zarif visited Damascus 
				to discuss plans for an upcoming summit between the leaders of 
				Iran, Russia and Turkey, which Tehran will host on Sept. 7 to 
				discuss Idlib, Iran's Fars news agency reported.
 
 Turkey, which has long supported anti-Assad rebels, has 
				cooperated with Russia and Iran on talks over Syria in recent 
				years and has troops in the Idlib region on an observation 
				mission.
 
 Last week, Iran's defense minister traveled to Damascus and 
				signed an agreement for defense cooperation between the two 
				countries with his Syrian counterpart.
 
 (Reporting by David Shepardson; Editing by Alistair Bell)
 
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