Signs of de-escalation in the U.S.-Iran conflict: Can the 2026 sovereign debt storm be calmed?

The 2026 sovereign bond storm may be dissipating. Signs of a clear de-escalation in the U.S.-Iran conflict are giving investors, who have endured months of oil-driven turbulence, their first glimpse of calm. Oil has dominated the bond market's trajectory this year. Since last week's midterm elections, the shift in Washington's stance on the Iran conflict could become the market's biggest catalyst going forward. U.S. President Trump has repeatedly said this week that the war has "effectively ended," and his administration appears eager to embrace the voters' will. The war has been deeply unpopular largely because it drove up U.S. crude and fuel costs, which seeped into broader inflation and ultimately led the Federal Reserve to raise rates starting in September. Fuel-driven inflation combined with rising borrowing costs is politically devastating. The most recent example is the 2024 White House race, which Trump won on precisely this basis. But if the war has indeed effectively ended and the oil risk premium gradually fades, can bond investors treat this eight-month conflict as a temporary disruption and buy heavily into bonds whose yields are at multi-decade highs? This question has become a core consideration for many forward-looking strategies. Oil Price Retreat and Inflation Concerns: Can the Bond Market Catch Its Breath? The surprise U.S. and Israeli attacks on Iran in February sent oil prices soaring, as one-fifth of the world's crude supply must transit the Persian Gulf, and the attacks disrupted that channel. Brent crude futures surged more than 70% in April to a four-year high of $120 per barrel, and have since fallen below $90 this week. However, that is still nearly 30% higher than in February. An agreement to keep the Strait of Hormuz open could quickly eliminate the remaining war premium, but tight refining capacity means fuel prices may take longer to decline. According to AAA data, the average U.S. retail price for regular gasoline fell below $4 per gallon on Tuesday for the first time since July, but remains about 35% above pre-war levels. Tuesday's data also showed inflation remains elevated, nearly double the Fed's target. The U.S. Treasury market has closely tracked oil prices this year, with yields now well below the multi-decade peaks reached more than a month ago. Like still-elevated energy costs, the two-year Treasury yield remains a full 150 basis points above pre-war levels. The 10-year yield is around 5%, about 100 basis points higher than in February. Policy Signals: Fed Officials Hint at Larger Rate Hikes If the war subsides, will energy and debt costs follow? Ahead of Tuesday's alarming October CPI report, Fed Governor Christopher Waller said stronger measures may be needed. Waller said a 0.3% rise in October core CPI would prompt him to consider a 50-basis-point hike at the December 8-9 meetingdouble the Fed's usual increment. The data released later that day came in at exactly that reading, prompting Fed futures markets to price in a greater than 25-basis-point hike next month. Waller argued that officials have misjudged the policy impact on the economy: current restrictiveness is far from sufficient to bring inflation back to target, especially with the labor market tightening again. With headline inflation running at nearly double the Fed's target, unemployment at just 4.1%, economic growth potentially exceeding 3%, and financial conditions still historically loose, the Fed's real policy rate remains near zero. Waller said: "Inflation looks like it is starting to deviate from our target rather than approaching it. Then we have to adopt more aggressive monetary policy." Dallas Fed President Lori Logan subsequently said policy remains about 50 basis points below the moderately restrictive level needed. She said there is a possibility of "moving faster" this winter to reach that level. These remarks may reflect the Fed's pre-midterm-election pause on rate hikes last month, but even a sharp oil price retreat would not much alter its ultimate rate target. Both officials acknowledged that energy prices have retreated since the election, but insisted energy is not the only factor driving inflation higher. Waller also stressed that damaged refining capacity could delay the pass-through of further crude price declines to retail and commercial fuel costs. Larger rate hikes over the next two months could cool the economy faster and clear the way for the bond market next year. Deep-Seated Concerns: Deficit Pressure and the AI Borrowing Frenzy Beyond oil, the bond market faces other problems. Ballooning annual budget deficits and debt are raising questions about debt sustainability and pushing up related risk premiums, while political will to address them is scarce. In addition, economic heat from the AI investment boom is exacerbating inflation and has triggered a borrowing frenzy among so-called "hyperscalers," a bond boom that has them competing with governments for capital. The political earthquake of the U.S. midterm elections could also slow data center construction, and in turn slow spending, borrowing, and GDP growth. BlackRock strategists said this week that post-election questions surrounding AI buildout have created "two-way uncertainty," one reason they have been more optimistic on U.S. Treasuries over the past month. They said: "While the possibility of a sharp economic slowdown in 2027 is far from certain, it could have a significantly adverse impact on markets. However, a slowdown could also ease competition for capital, lower bond yields, and its economic impact could moderate policy actions." Morgan Stanley's annual debt sustainability analysis published last week noted that despite the anxiety pervading sovereign bond markets this year, nominal growth from AI spending and higher inflation has actually improved short-term sustainability model assessments for many economies. However, the report added that as debt is gradually refinanced, rising debt service costs tied to high bond yields will materialize with a lag, and many countries still urgently need to put their fiscal budgets in order. Lowering yields is essential to keeping bond markets running smoothly, which will refocus attention on oil and central bank policy. Still, the sense of crisis in this year's bond market may finally be starting to fade.