Its not just the US. A western democracy has never been issued a warrant like this. It's not that hard to find crimes being committed by western leaders (is no one listening to this seasons Serial podcast? Guantanamo is still open).

If this goes through every western leader past and present can have a warrant out for them at any minute, it really doesn't take much to find 1 suspected violation and a need to arrest and stand trial to see if they are guilty.