Turkish President Tayyip Erdogan and U.S. President Donald Trump agreed in an overnight phone call on joint action against Islamic State in the Syrian towns of Raqqa and al-Bab, both held by the militants, Turkish presidency sources said on Wednesday.
U.S.-Turkish differences during former President Barack Obama's administration impeded the U.S.-led campaign against Islamic State, and closer coordination could mean faster progress towards freeing swathes of northern Syria from IS.
Erdogan now hopes that relations with Washington, strained by the presence in the United States of a cleric he blames for an attempted military coup last year and by U.S. support for Kurdish militia in Syria, can be reset under Trump.
Turkey has the second largest army in the NATO alliance and is key to any success in rolling back and eventually neutralising IS in Syria and Iraq where IS declared a cross-border caliphate after lightning advances in 2014.