Why Japan Steps Gingerly in the Middle East
Japan, which must import almost all its oil, is more dependent on Middle East crude than it was in 1973 despite spending decades of developing other sources of energy; disruption of oil flow from Middle East because of new Middle East war, could idle Japanese factories and throw Japan back into recession; Japan's Prime Min Junichiro Koizumi, reluctant to alienate oil-producing countries, has hedged his support for Pres Bush's campaign to attack Iraq; analysts say Japan may offer only moral support; Japan remains confident that it can secure enough oil to offset any temporary loss of Middle East crude; country has formidable stockpile of fuel, enough to last 171 days; graph (M)