Cathay Pacific Airways has diverted a Hong Kong-to-New York flight to Tokyo after a passenger reported feeling unwell during the journey.

In Tokyo, the Nikkei 225 lost 1.7% to 37,993.18. It has retreated since the ruling Liberal Democratic Party chose Shigeru Ishiba to lead the government, replacing Fumio Kishida, who stepped aside on Tuesday. A weaker Japanese yen and higher energy prices would add to Ishiba's burdens as he works to pep up the economy.