SynopsisJapanese government bonds rallied on Thursday as a US Treasury move to boost liquidity support for longer-dated debt eased pressure across global bond markets. Long-term JGB yields fell, while strong demand at a 20-year bond auction offered further support. Investors, however, remained cautious over inflation, oil prices and debt levels.ReutersJapanese government bonds rallied on Thursday as a U.S. Treasury move to support longer-dated debt eased pressure across global bond markets and offered some relief to investors worried about rising borrowing costs, Reuters reported.The benchmark 10-year JGB yield fell 5.5 basis points to 2.835%, while the 20-year yield declined 8.5 basis points to 3.690%. Bond yields move inversely to prices.Long-dated U.S. Treasuries gained on Wednesday after the U.S. Treasury Department announced plans to double the size of its liquidity-support buyback operations for longer-dated notes and bonds. The move helped reverse a sharp rise in long-term borrowing costs that had spread across major global debt markets.Japan's Long-Term Yields RetreatJapan's longest-dated bonds also benefited from improved global sentiment. The 40-year JGB yield dropped 9.5 basis points to 4.055%, while the 30-year yield eased 8.5 basis points to 3.995%.The five-year JGB yield declined 3 basis points to 2.090%, retreating from a record high reached earlier in the week. Meanwhile, the two-year yield, which is particularly sensitive to expectations for Bank of Japan policy rates, was largely unchanged.The rally came as investors reassessed the outlook for long-term borrowing costs after the U.S. Treasury intervention. Reuters reported that the move appeared to have temporarily eased the broader global rise in long-term interest rates.Strong Demand at 20-Year Bond AuctionJapan's Ministry of Finance sold around 2.5 trillion yen ($15.78 billion) of 20-year bonds on Thursday. The auction recorded a bid-to-cover ratio of 3.98, indicating demand remained relatively solid, though weaker than at the previous sale in July.The ratio was still above its average level over the past year, suggesting investors continued to show interest in Japanese long-duration debt despite the recent surge in yields.Market participants have been closely monitoring demand for longer-maturity JGBs as concerns over government debt supply and changing monetary policy expectations have contributed to volatility.Global Debt Market Concerns RemainLong-term borrowing costs in the United States, Germany and Japan reached multi-decade highs earlier this week as investors became increasingly concerned about rising government debt levels and persistent inflation pressures.Higher oil prices linked to the ongoing Middle East conflict have added to those inflation concerns, raising questions about how quickly major central banks can ease monetary policy.Reuters reported that the U.S. Treasury's decision to increase support for longer-dated debt has helped interrupt the recent global rise in long-term yields, although investors remain cautious about whether the improvement will persist.The shift in global bond markets could also influence expectations for Japan, where speculation has increased that authorities may consider measures to improve supply-and-demand conditions in the JGB market.For now, Thursday's decline in long-term JGB yields offers some relief after the sharp increase in borrowing costs earlier in the week, but investors remain focused on inflation, oil prices, government debt issuance and the future path of Bank of Japan policy.Read More News on(What's moving Sensex and Nifty Track latest market news, stock tips, Budget 2025, Share Market on Budget 2025 and expert advice, on ETMarkets. Also, ETMarkets.com is now on Telegram. For fastest news alerts on financial markets, investment strategies and stocks alerts, subscribe to our Telegram feeds .) Subscribe to ET Prime and read the Economic Times ePaper Online.and Sensex Today. Top Trending Stocks: SBI Share Price, Axis Bank Share Price, HDFC Bank Share Price, Infosys Share Price, Wipro Share Price, NTPC Share Price...moreless(You can now subscribe to our ETMarkets WhatsApp channel)Read More News on(What's moving Sensex and Nifty Track latest market news, stock tips, Budget 2025, Share Market on Budget 2025 and expert advice, on ETMarkets. Also, ETMarkets.com is now on Telegram. For fastest news alerts on financial markets, investment strategies and stocks alerts, subscribe to our Telegram feeds .) Subscribe to ET Prime and read the Economic Times ePaper Online.and Sensex Today. Top Trending Stocks: SBI Share Price, Axis Bank Share Price, HDFC Bank Share Price, Infosys Share Price, Wipro Share Price, NTPC Share Price...moreless