(S (S (S (BASENP (NNP North) (NNP Korea)) (VP (VBZ has) (VP (VBN warned) (PP (IN of) (NP (QT (DQL ``) (BASENP (JJ self-defensive) (NNS blows)) (DQR '')) (PP (TO to) (BASENP (NNP South) (NNP Korea)))))))) (SBAR (IN if) (S (BASENP (PRP they)) (VP (VBP participate) (PP (IN in) (NP (NP (NP (ADJP (JJ joint) (COMMA ,) (JJ live-fire)) (BASENP (JJ military) (NNS exercises))) (PP (IN with) (BASENP (DT the) (NNP United) (NNPS States)))) (COMMA ,) (VP (VBN scheduled) (S (VP (TO to) (VP (VB begin) (PP (IN in) (BASENP (DT the) (ADJP (JJ next) (JJ few)) (NNS days))))))))))))) (PERIOD .))