(S (S (S (BASENP (DT Both) (NNS nations) (JJ former) (NNS leaders)) (VP (VBD spoke) (PP (IN about) (NP (BASENP (DT the) (NNS challenges)) (SBAR (S (BASENP (PRP they)) (VP (VBD faced) (PP (IN during) (NP (BASENP (PRPD their) (NNS times)) (PP (IN in) (BASENP (NN office)))))))))))) (SBAR (SBAR (IN in) (NN order)) (S (VP (TO to) (VP (VP (VB bring) (BASENP (DT the) (JJ former) (NNP Warsaw) (NNP Pact) (NNS countries))) (PP (IN into) (BASENP (DT the) (NNP West)))))))) (PERIOD .))