(S (S (BASENP (NNP Russia)) (VP (VBZ has) (VP (VP (VBN invited) (NP (BASENP (NNS leaders)) (PP (IN of) (BASENP (DT the) (NNP Hamas))))) (PP (IN for) (NP (BASENP (NNS talks)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (MD will) (VP (VB begin) (PP (IN on) (BASENP (NNP Friday)))))))))))) (PERIOD .))