"Nations don't invade other nations"???

According to John McCain, "In the 21st century, nations don't invade other nations."

Well, obviously they do, as a certain Republican war proves. I wish it wasn't true, but it is.

Isn't that right, Mr. Hundred Years' War?

(Source: http://www.dailykos.com/storyonly/2008/8/13/171547/963/27/567469)