(S (S (S (BASENP (NNP China)) (VP (VBZ has) (VP (ADVP (RB usually)) (VP (VBN hesitated) (S (VP (TO to) (VP (VB support) (NP (BASENP (JJ international) (NN intervention)) (PP (IN in) (BASENP (JJ national) (NNS situations))))))))))) (COMMA ,) (SBAR (IN as) (SBAR (WHADVP (WRB when)) (S (BASENP (DT a) (NNP United) (NNPS Nations) (NN resolution)) (VP (VBD was) (VP (VBN invoked) (S (VP (TO to) (VP (VP (VB support) (NP (NP (BASENP (DT the) (NN bombing)) (PP (IN of) (BASENP (NNP Libya)))) (PP (IN by) (BASENP (NNP NATO) (NNS forces))))) (BASENP (JJ last) (NN year))))))))))) (PERIOD .))