India, Jan. 10 -- ALEPPO, Syria, January 10 - The Syrian army has threatened renewed airstrikes on the predominantly Kurdish Sheikh Maqsud district of Aleppo, declaring a brief ceasefire has collapsed. The breakdown highlights the deep challenge of integrating Kurdish-led forces into the state a year after the fall of President Bashar al-Assad's regime.

Early Friday, Syrian government officials announced a ceasefire deal with Kurdish fighters from the U.S.-backed Syrian Democratic Forces (SDF). The deal proposed the fighters move east with their light weapons. Kurdish leaders rejected the terms, calling it a forced surrender, and refused to leave their areas. By the same afternoon, the Syrian army warned it would resume airstrikes on She...