(S (S (BASENP (PRP They)) (VP (ADVP (RB also)) (VP (VBD confirmed) (SBAR (IN that) (S (BASENP (NN none)) (VP (VP (VBD had) (VP (VBN approached) (BASENP (DT a) (JJ foreign) (NN state)))) (CC and) (VP (VBD had) (VP (VBN been) (VP (VBN shadowed) (PP (IN by) (NP (BASENP (NN aircraft)) (PP (IN from) (BASENP (NNP Nato) (NNS countries)))))))))))))) (PERIOD .))