:* Hanibal911 says: "...The tomb, which is on a site within Syria that Ankara considers sovereign territory,..."
Ankara Treaty 1921: http://www.hri.org/docs/FT1921/Franco-Turkish_Pact_1921.pdf 
Article 9: The tomb of Suleiman Shah, the grandfather of Sultan Osman, founder of the Ottoman dynasty (the tomb known under the name of Turk Mezari), situated at Jaber Kalesi shall remain, with its appurtenances, the property of Turkey, who may appoint guardians for it and may hoist the Turkish flag there.
Hanibal911, since 1921 no Syrians entered the tomb's area without the allowance of Turkey, and cannot enter hereafter as well. You say "...Ankara considers...". It is not only "...Ankara considers..." but also "...accepted and respected by Damascus and the others...". After Syria lost the territory (all the areas and territories around the tomb) to ISIL, ISIL respected the tomb's area as well. Turkish government said any attack on the tomb is a casus belli.212.174.38.3