Yeah, but he didn't say "another", he said a "neighboring" nation. A "nation" (as distinct from a state) can neighbor territory that is not governed by a "nation" (or a state)."Another nation" as in "a nation that is separate and distinct from this nation"
You find me a Russian official who has ever said Chechen rebels have launched terrorist attacks in another nation, when they meant Russia, and I will buy you a litre of vodka.