(S (S (BASENP (DT An) (JJ alleged) (JJ Russian) (NN spy)) (VP (VBD was) (VP (VP (VBN arrested) (PP (IN in) (BASENP (NNP Montreal)))) (COMMA ,) (S (VP (VBG having) (VP (VBN threatened) (BASENP (JJ national) (NN security)))))))) (PERIOD .))