(S (S (BASENP (JJ Such) (JJ human) (NNS rights) (NNS concerns)) (VP (VBP have) (VP (ADVP (RB long)) (VP (VBN served) (PP (IN as) (NP (BASENP (DT a) (JJ stumbling) (NN block)) (PP (IN for) (NP (NP (BASENP (NNP Turkey) (POS 's)) (NN attempts)) (S (VP (TO to) (VP (VB join) (BASENP (DT the) (NNP European) (NNP Union))))))))))))) (PERIOD .))