Ankara, Turkey — Turkish and British officials will discuss Syria’s future during a meeting in Ankara on Monday, with security, sanctions and economic development on the agenda, a Turkish foreign ministry source said Sunday. NATO-member Turkey was a main backer of rebels who fought Bashar al-Assad for years and it has forged close ties with the new administration in Damascus following Assad’s ouster last year. It has promised to help rebuild Syria and offered assistance to train and equip its security forces. Britain said last month it would adapt its Syria sanctions regimes after Assad’s fall, but will ensure asset