Long standing in history, long standing in diplomacy, long standing in actual freaking Louis XIV administration communique, long standing in practically everything.
No offense but just because you people have a beef with Russia at the moment and they are using the term, the rest of the world is not going to change how they speak so that you dont get offended.
> I don't think I've seen an authoritative source elsewhere use it
Long standing in history, long standing in diplomacy, long standing in actual freaking Louis XIV administration communique, long standing in practically everything.
No offense but just because you people have a beef with Russia at the moment and they are using the term, the rest of the world is not going to change how they speak so that you dont get offended.
> I don't think I've seen an authoritative source elsewhere use it
Obviously you are not a student of history.