(S (S (NP (BASENP (NNS Relations)) (PP (IN between) (BASENP (NNP Britain) (CC and) (NNP Russia)))) (VP (VBP have) (VP (VP (VBN worsened) (ADVP (RB recently))) (COMMA ,) (PP (ADVP (RB particularly)) (PP (IN after) (NP (NP (BASENP (NNP Russia) (POS 's)) (NN refusal)) (S (VP (TO to) (VP (VB allow) (NP (BASENP (DT the) (NN extradition)) (PP (IN of) (NP (BASENP (DT a) (JJ former) (NNP KGB) (NN bodyguard)) (VP (VBN suspected) (PP (IN of) (S (VP (VP (VP (VBG murdering) (BASENP (NN emigre) (NNP Alexander) (NNP Litvinenko))) (PP (IN in) (BASENP (NNP London)))) (BASENP (JJ last) (NN year)))))))))))))))))) (PERIOD .))