日本首相石破茂宣布决定辞职后，周一日经225指数一度涨近2%，抹去8月19日以来跌幅，逼近历史新高

Group 1 - The core point of the article is that the Nikkei 225 index surged nearly 2% following the announcement of Japanese Prime Minister Shigeru Ishiba's resignation, recovering losses since August 19 and approaching historical highs [1]. Group 2 - The announcement of the resignation had a significant positive impact on the stock market, indicating investor optimism [1].