ANKARA—Turkey said on Sunday its military killed 15 militants from the Syrian Kurdish YPG militia, which it said was preparing to carry out an attack in a region of northeast Syria controlled by Turkey and its Syrian rebel allies. In an offensive last year dubbed the Peace Spring Operation, Turkey seized a 120-km (75-mile) stretch of border territory in northeast Syria from the YPG, which it considers a terrorist organisation linked to the outlawed Kurdistan Workers Party (PKK) militia. “Our heroic commandos dealt another heavy blow to the PKK/YPG terrorist organisation. Fifteen PKK/YPG terrorists trying to infiltrate the Peace Spring region from the south to carry out an attack were neutralised with the successful intervention of our commandos,” Turkey’s Defence Ministry said on Twitter. Turkey halted its offensive, which was widely condemned by Ankara’s Western allies as the YPG was a key U.S. ally in the fight against ISIS terrorist …