Renewed hostilities between 907 and 911 ended with a new treaty under which any Rus ' who chose could serve Byzantium as a right .
A clause in the treaty obliged Rus ' to provide men for Byzantine service .
Renewed hostilities between 907 and 911 ended with a new treaty under which any Rus ' who chose could serve Byzantine as a right .
A clause in the treaty obliged Rus ' to provide men for Byzantine service .