The minister said continued cooperation between Sudan and South Sudan was important to maintaining stability.
The U.S. government says routine visa services in Abuja and 24 other African cities will end on August 1.
The initiative is expected to boost public awareness and encourage broad participation.
Preliminary findings suggest the aircraft may have crashed due to poor visibility.
Mr Youssef said South Sudan is still recovering from years of conflict.
The radio station was shut down in March 2018 over noncompliance with local media laws.
