I think it's probably an error in protocol; seems to me that world leaders should greet each other with respect, but none of the formal acts of subservience. I could make an exception for a Catholic leader to kiss the Pope's hand, I suppose, but other than that, I don't think it's necessary or particularly appropriate.
However, I also don't see any major harm done, and if this is what occupies people, there aint much goin on.
However, I also don't see any major harm done, and if this is what occupies people, there aint much goin on.