The plea for help came from Sweden: Two young Muslim males had left Stockholm for Syria and would soon be terrorists-in-training unless authorities in Turkey could intercept them.

Turkish security caught the men arriving at an airport in Istanbul with one-way tickets and camouflage gear, officials said. The two were sent back to Sweden and the trouble averted — until eight days later, when the same duo turned up at a Turkish seaport, this time arriving by ferry from the Greek island of Kos.

The back-to-back deportations of those would-be militants last year were in some ways a sign of substantial progress in the cooperation between Western governments and Turkey in sharing intelligence and stemming the flow of foreign fighters to Syria.

Read More- The Washington Post