On a surprise trip to Russia, the Syrian leader talked about peace initiatives with the president, who said Russia's military campaign in Syria is wrapping up.
Pro-government forces defeated the militant group in its last major stronghold in Syria, leaving the militants to defend strips of desert territory.
Turkey is outraged by a reported deal that would threaten autonomy for Kurds backed by that country.
The linguist and activist offers blunt assessment of the administration's foreign policy as the president conducts his first Asian tour.
Syria's army has taken control of the city of Al-Bu Kamal, the last base for Islamic State on the Syrian-Iraqi border.
The move leaves the United States as the only United Nations member state not supporting the agreement.