https://fr.wikipedia.org/wiki/Trait%C3%A9_Ciel_ouvert
https://en.wikipedia.org/wiki/Treaty_on_Open_Skies
https://www.osce.org/library/14127
![](https://i1.wp.com/lf5422.com/wp-content/uploads/2020/05/Capture-d’écran-2020-05-23-à-15.06.14.jpg?fit=594%2C393&ssl=1)
![](https://i1.wp.com/lf5422.com/wp-content/uploads/2020/05/Capture-d’écran-2020-05-23-à-15.07.13.jpg?fit=594%2C321&ssl=1)
![](https://i0.wp.com/lf5422.com/wp-content/uploads/2020/05/Capture-d’écran-2020-05-23-à-15.01.19-Openskies.jpg?fit=594%2C702&ssl=1)
![](https://i0.wp.com/lf5422.com/wp-content/uploads/2020/05/Capture-d’écran-2020-05-23-IMG_2022-OpenSkies.jpg?fit=594%2C294&ssl=1)
https://fr.wikipedia.org/wiki/Trait%C3%A9_Ciel_ouvert
https://en.wikipedia.org/wiki/Treaty_on_Open_Skies
https://www.osce.org/library/14127