West-German Church Leader On His Way To Moscow -- Doctor Martin Niemoller (right), West-German Evangelical church leader, pictured on his arrival in Berlin from Western Germany. With him are his daughter, Hertha, and Probst Heinrich Grueber, liaison man of the Lutheran Church to the East-German Government. Doctor Martin Niemoller, West-German Evangelical church leader and opponent of German rearmament, arrived in Berlin on the first leg of his trip to Moscow. Niemoller, who was imprisoned in a Nazi concentration camp, said that the final date of his departure for Moscow will be fixed after discussions with local representatives of the Russian Orthodox Church which has invited him to Russia. He said he intends to discuss three main subjects in Russia: Improvement of the co-operation between the Russian Orthodox Church and other European churches: the fate of hundreds of thousands of German prisoners of was still believed to be held in Russia, and ways to tale religious care of German ex