Japan's Nikkei share average reversed its upward trend on Thursday, closing at 59,140.23, a 0.75% decrease after reaching a record high of 60,013.98 earlier in the day. This decline was driven by profit-taking as investors reacted to geopolitical uncertainties surrounding the Middle East conflict and weakening U.S. stock futures. The broader Topix index also fell, down 0.76% to 3,716.38. The market's early gains were initially supported by U.S. President Donald Trump's announcement of an extended ceasefire with Iran, although this was met with skepticism from Iranian officials. The ongoing geopolitical tensions, particularly in the Strait of Hormuz, have kept oil prices elevated, prompting investors to reassess their positions. The Nikkei has managed to recover all losses since the start of the U.S.-Iran war in late February, primarily driven by a select group of artificial intelligence-related stocks like SoftBank Group and Advantest. However, the overall market remains cautious as the broader Topix has not kept pace with the rally, evidenced by the NT ratio reaching a record high of 15.91.