(S (S (BASENP (NN Four) (NNP F3) (NNP Tornado) (NN fighter) (NNS jets)) (VP (VBD were) (VP (VP (VBN launched) (PP (IN by) (NP (BASENP (DT the) (NNP United) (NNP Kingdom) (POS 's)) (BASENP (NNP Royal) (NNP Air) (NNP Force))))) (S (VP (TO to) (VP (VB intercept) (BASENP (JJ Russian) (JJ military) (NNS planes)))))))) (PERIOD .))