The west hardly cares about soft power. Can you give an example of some soft power that wasn't due to a legal agreement? I came up dry just now thinking of some example that the west has set that the rest of the world has followed purely on the idea of it alone. There's always some sort of formal agreement it seems when it comes to these sorts of things, e.g. forms of government, trade, mutually passed laws like drug scheduling or extradition.