The Nikkei 225 has reached a record high, with some reports citing a surge of over 5%. The increase is attributed to hopes of a ceasefire between the US and Iran, as well as a rally in the semiconductor sector, although the exact details of the US-Iran agreement and its impact on the market are unclear. The Nikkei 225 has surpassed various milestones, including 65,000 and 72,000, amid differing reports on the drivers of the rally.