Ankara has sent military servicemen to Russia to undergo a training course on the use of the S-400 missile systems, Turkish Defense Minister Hulusi Akar said. This reported by TASS.

"We have sent our specialists to Russia to undergo a training course on the use of the S-400 systems, the course will start today and last several months," he said, as cited by the Milliyet newspaper. "The number of the personnel keeps changing, all of them have their own goals," Akar added.

The Turkish defense minister also mentioned a new proposal from the United States. "On March 28-29, a new proposal came that concerns the Patriot missile systems. Talks are underway on their price, the transfer of technology and joint production," Millyet quoted Akar as saying.

Meanwhile, a group of US lawmakers submitted a document calling for imposing sanctions on Turkey under the Countering America’s Adversaries Through Sanctions Act (CAATSA) and excluding Ankara from the F-35 program if Turkey purchases the S-400 systems from Russia.