Tokyo: Japan's Nikkei index closed Wednesday's session at its highest level in more than a month, buoyed by expectations of a new round of peace talks between the United States and Iran. This development boosted investor sentiment despite a decline in crude oil prices.

According to Qatar News Agency, the Nikkei index rose 0.44 percent to conclude the session at 58,134.24 points, marking its highest level since the record close on February 27. The index nearly recouped all the losses incurred since the outbreak of the war between the United States and Iran the following day, after an earlier increase of about 1.2 percent during the session.

The broader Topix index also saw gains, climbing 0.4 percent to reach 3,770.33 points. Overnight, the Nasdaq index rose 2 percent, while the SandP 500 ended trading with a 1 percent increase.

In individual stock performance, shares of SoftBank Group, an investor in artificial intelligence technology, surged 4.76 percent. Advantest, a chip testing equipment manufacturer, saw a gain of 2.17 percent. In contrast, Tokyo Electron, a chipmaking equipment manufacturer, saw a slight decline of 0.46 percent, and Fast Retailing, the owner of the Uniqlo clothing brand, decreased by 0.38 percent.

Moreover, shares of memory chip maker Kioxia fell sharply by 7.2 percent, although the stock remains up 70 percent for the month. Of the over 1,600 stocks traded on the Tokyo Stock Exchange's main market, 64 percent rose, 32 percent fell, and 2 percent were unchanged.