The provisions of the agreement open a legal avenue for Turkey to act in Syria, with the full agreement of Russia. The Adana agreement lasted until 2011, when Turkish support for the Syrian opposition in the context of the civil war ended goodwill between the two countries and the Syrian government again began to support Kurdish groups to counterbalance Turkish efforts in Syria.  The Syrian government said that Turkey had violated the understanding of the agreement by arming rebel groups inside Syria.  In 2012, Turkish officials accused the Syrian government of directly supporting the PKK.  He added that Ankara could use the Adana Agreement to legally justify Turkish operations inside Syria, as Syria was obliged, under the 1998 agreement, to prevent Kurdish fighters from using its territory as the scene of attacks inside Turkey. „Syria, on the basis of the principle of reciprocity, will not allow activities that depart from its territory and are supposed to jeopardize Turkey`s security and stability. Syria will not allow the supply of PKK weapons, logistical equipment, financial support and propaganda activities on its territory,“ an article in the agreement said. On 9 August 2011, the BBC and other news websites reported that Turkey had sent its foreign minister, Ahmet Davutoglu, to Syria to send a „hard“ message to the government. Erdogan said he was getting impatient with the „savageness“ of Bashar al-Assad`s government.  Ahmet Davutoglu also announced: „We are totally suspending all these trade relations, all agreements between Turkey and Syria have been suspended.“ The Adana agreement, signed by Turkey and Syria on 20 October 1998, was the most critical topic on the agenda of the meeting between Turkish President Recep Tayyip Erdogan and Russian President Vladimir Putin on 23 January.
The two heads of state and government discussed the agreement at their joint press conference. Putin stressed that the 20-year-old agreement between Ankara and Damascus remained binding, while Erdogan stressed its importance and said Turkey would keep it on its agenda. It was the first meeting between the two heads of state since the announcement of the U.S. decision to withdraw its troops from Syria. That is why their discussions were already important – and the issue of the Adana agreement became even more important. What is this 1998 agreement and why is it back on the agenda after seven years of conflict in Syria? The Adana agreement was signed at a time when relations between Turkey and Syria were tense and neighbours were on the brink of war.