Ankara aims to reach full domestic capability in airspace defence, which has seen multiple rocket attacks from neighbouring war-torn Syria.
Washington is engaged with Ankara over "an F-35 dispute resolution," says US State Department spokesperson Ned Price, but adds he would not "prejudge the outcome of" those discussions.
Project aims to protect population in and around Seoul, which lies within range of North Korea’s artillery.
Turkish presidential spokesman said that US President-elect Biden "knows Turkey," including its political actors and landscape.
NATO’s official position on Turkey’s S400 is one of respect for its sovereign defence choices, but NATO members have expressed different reservations that sometimes overlook similar Russian defence purchases of their own.
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