 Complete the following phrase:  On 26 February 2016, the United Nations Security Council uimously adopted resolution 2268 that endorsed a previously brokered U.S.-Russian deal on a cessation of hostilities. The cease-fire started on 27 February 2016 at 00:00 Damascus time. The ceasefire does not include attacks on UN-designated terrorist organizations. At the close of February 2016, despite individual clashes, the truce was reported to hold. By the end of March, the Syrian Baathist government forces with support from Russia and Iran successfully 