2017 Central Syria campaign
Its goal was to capture the strategic oil town of Al-Sukhnah , and besiege and capture 11 , 000 square kilometers of ISIL territory in central Syria , after which the Syrian Army would advance towards Deir ez-Zor , and lift the three-year ISIL siege of the government's enclave in the city . 
<triplet> the three-year ISIL siege <subj> Deir ez-Zor <obj> location