AGREEMENT REACHED IN GREEK ALUMINA DEAL WITH MOSCOW Greece and the Soviet Union have reached agreement in Moscow on a joint venture for a 450 mln dlr alumina plant in Greece, government spokesman Yannis Roubatis said. Roubatis told reporters the Soviet Union agreed to buy the plant's entire annual output of 600,000 tonnes of alumina. More details would be given later by Greek Industry Undersecretary George Petsos, who was in Moscow. The project was due to start in 1986, but problems over plans to sell some alumina to Bulgaria caused delays. The Soviet Union, which was to take 400,000 tonnes, later agreed to take the full production.