(S (S (NP (BASENP (NNP Israel) (POS 's)) (BASENP (JJ naval) (NNS ships))) (VP (VBP have) (VP (VP (VBN entered) (NP (BASENP (NNP Lebanon) (POS 's)) (BASENP (JJ territorial) (NNS waters)))) (S (VP (TO to) (VP (VP (VB enforce) (NP (BASENP (DT a) (NN blockade)) (PP (IN on) (BASENP (DT the) (JJ Levantine) (NN state))))) (COMMA ,) (BASENP (NNP Thursday)))))))) (PERIOD .))