I say stuff protocol. Courtesy and common sense ought to take precedent over protocol designed by bean pushers and diplomats.
That's a problem, Garf, you don't have a say. That's a good thing. You speak not from knowledge of all the different international cultures and traditions that each head of state honors and respects, but from a crass set of manners. If they followed your practical simplistic answer, there would never be an agreement reached. You might want to pick up a copy of Emily Post or Amy Vanderbilt book on manners.