ITOCHU & SANKYU TO TAKE 50 PCT STAKE EACH IN SINGAPORE'S SWTS; DEAL ESTIMATED IN TENS OF BLNS OF YEN; TRANSACTION EXPECTED TO CLOSE IN MAY - NIKKEI ITOCHU & SANKYU AIM TO EXPAND SOUTHEAST ASIA OPERATIONS & ENTER MIDDLE EAST PETROLEUM PLANT MARKET THROUGH ACQUISITION - NIKKEI
