Relations between Syria and Turkey has been uneasy most of the time. In the 1990’s the two countries were on the brink of war–war that was prevented only by neighbors’ intervention and the signing of an agreement that addressed both governments’ concerns. Turkey wanted Syria to stop its support for the Kurdish rebels and Syria sought assurances that its territory and natural resources are protected. Twenty years later, that agreement may become useful again. Turkey still needs to deal with resurgent Kurdish presence in northern Syria, and now Syria wants armed groups supported by Turkey since the start of the crisis in 2011 dealt with. The agreement, given the changed circumstances, must be renegotiated, though the primary structure about reciprocity and mutual interest will remain valid and compelling for both sides in order to avoid prolonged conflict.
The agreement signed in Adana was mediated by Iran and Egypt. This time around, Russia will substitute for Egypt and Iran will continue to play the same role in played in 1998.
Here are the terms of the Adana Agreement: