sentences:  The Secretary for Foreign Affairs, Bernhard von Bülow, did not believe that Britain would be a reliable ally because any future Cabinet could reverse the diplomatic policy of its predecessors, and because Parliament and public opinion often made difficulties about Britain's alliance commitments.Von Bülow preferred the co-operation of Russia in China to that of Britain.Hatzfeldt was instructed to make an agreement appear likely without ever conceding to Chamberlain.