SOVIET THREATS: Moscow, 13 – The Russian government has handed the Greek ambassador in Moscow a memorandum regarding the installation of foreign missile bases on Greek territory. Moscow radio broadcast a summary of the text, which said that the Russian government found it necessary to tell the Greek government in no uncertain terms that the installation of the bases would be considered hostile toward the Soviet Union and would harm bilateral relations. The Russian government expressed the hope that the Greek government would carefully consider the views expressed in the memorandum and, while there was still time, would not cross the line and help certain foreign powers implement their aggressive plans. COLD WAR: Geneva, 13 – There was no notable progress at today’s session of the quadripartite foreign ministers’ meeting here, but the risk of a stalemate caused by Soviet insistence on the participation of Poland and Czechoslovakia was averted. The US delegate said his government would be willing to take part in summit meetings if the quadripartite meeting made satisfactory progress.