Under Open Skies, countries that are part of the treaty must notify other nations 72 hours in advance of a mission to conduct an observational flight, to which the host country has one day to respond.

Under Open Skies, countries that are part of the treaty must notify other nations 72 hours in advance of a mission to conduct an observational flight, to which the host country has one day to respond.https://t.co/1wPwtclafC

— The Grey Man (@IntelOperator) October 8, 2019