Turkey regards as a "positive step" a U.S. pledge to take back weapons supplied to the Kurdish YPG militia in Syria after the defeat of Islamic State and said its implementation was essential, Defense Minister Fikri Isik said on Friday.

In an interview with broadcaster NTV, Isik also said Turkey would retaliate if it faced any threat from the YPG, which Ankara regards as a terrorist group tied to militants who have fought a three-decade old insurgency in southeast Turkey.