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Updated from 12:43 a.m. EDT.

Japanese Prime Minister

Keizo Obuchi

is in intensive care after suffering a stroke Sunday, and Chief Cabinet Secretary

Mikio Aoki

is in place as acting prime minister, according to press reports.

The news has had no discernible ill effect on stock trading in Tokyo, with the benchmark

Nikkei 225

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lately up 1.9%. A strong


business sentiment survey and a weakening of the yen after a

Bank of Japan

currency intervention are spurring stocks higher.

Obuchi, 62, was hospitalized early Sunday in Tokyo after complaining of fatigue. In recent days he has been busy dealing with a volcanic eruption on Hokkaido, the breakup of his three-party ruling coalition and preparations for the July


summit. Nevertheless, as the market's reaction seems to show, Obuchi's illness looks unlikely to seriously derail the functioning of Japan's government.