(S (S (BASENP (DT The) (NNS tankers)) (VP (VBD sank) (PP (IN in) (NP (NP (BASENP (DT the) (NNP Strait)) (PP (IN of) (BASENP (NNP Kerch)))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VBZ links) (NP (BASENP (DT the) (NNP Black) (NNP Sea)) (CC and) (NP (BASENP (DT the) (NNP Sea)) (PP (IN of) (BASENP (NNP Azov)))))) (PP (IN in) (BASENP (DT the) (NN northeast)))))))))) (PERIOD .))