Greece is conveying its concerns to the US over the potential return of Turkey to the F-35 fighter jet program, while emphasizing that weapons sold to one ally should not be used against another, according to senior diplomatic sources.

The comments came after discussions between US President Donald Trump and Turkish President Recep Tayyip Erdogan about the possibility of Turkey rejoining the program for the fifth-generation American aircraft.

The sources described such restrictions as “self-evident,” while acknowledging that Greece cannot dictate the defense procurement policies of third countries.

Athens can, however, communicate its positions and sensitivities, particularly in light of what it views as a threat of war, or casus belli.

The sources said the Greek government has already raised the issue with the US administration.