"In the 21st century nations don't invade other nations."
-- Sen. John McCain, on the conflict in Georgia
Nope, I guess they don't "invade".
However, perhaps McCain thinks nations 'occupy' or 'overrun' other nations. Or maybe 'raid' might be a better 21st century word. Or, it's a military foray, perchance?
It could be an assault, attack, encroachment, or a penetration. Or maybe a blitzkrieg. Or maybe the term 'trespass' might be applicable.
But certainly not 'invade'. That something that no nation would ever do in the 21st century.