On Monday, Japan's government bond yield curve steepened as caution prevailed ahead of a crucial 30-year debt auction. The 10-year Japanese Government Bond (JGB) yield rose 3 basis points to 2.410%, its highest since February 1999. The 20-year bond yield surged 5.5 basis points to 3.32%, while the 30-year bond yield increased 6 basis points to 3.735%. This steepening of the curve indicates that long-term interest rates are rising faster than short-term rates, reflecting concerns about inflation due to increasing oil prices and a weakening yen. Market participants are particularly wary following a disappointing demand for the previous 10-year bond auction, which was affected by geopolitical tensions involving the U.S. and Iran. In addition, JGB yields tracked higher alongside U.S. Treasury yields following strong U.S. payroll data, indicating a broader market trend.