US Bonds No Longer Protect Against Crisis: Why Safe Havens Have Gone Quiet

There is one of the strongest rules in investing: when stocks fall, bonds rise. That is especially true for US government bonds, Treasuries. When markets panic, investors around the world "fly to quality" and buy US sovereign debt. Treasury yields fall, prices rise, and a portfolio balanced between stocks and bonds absorbs part of the shock.

That was true in 2008. It was true in 2020. It is how the classic 60/40 model worked for four decades.

The current crisis has broken that logic. Since the US-Iran war began in February 2026 and the Strait of Hormuz closed, yields on 10-year Treasuries have risen from 3.96% to 4.31%, which means bond prices have fallen. 30-year yields reached 4.88%. Stocks, the dollar, and bonds all declined at the same time.

This is not a small technical fluctuation. It is a structural break in market behavior, and anyone holding any form of savings should understand it.

What the "Normal" Reaction Should Have Been

To understand what went wrong, we first need to explain why bonds are traditionally considered a "safe haven."

US Treasuries are debt obligations of the US government. They are regarded as the safest asset in the world for several reasons: the US government has never defaulted on sovereign debt denominated in its own currency, the dollar remains the dominant reserve currency, and the Treasury market is the deepest and most liquid in the world.

When investors around the world are afraid, they want to get rid of risky assets and hide in something reliable. The most reliable option is Treasuries. Massive demand pushes their prices up and yields down. That is what a classic "flight to quality" looks like.

Over the last 40 years, that relationship was so stable that it became the foundation of an entire style of portfolio management: the 60/40 model, 60% stocks and 40% bonds. The logic is simple: when stocks fall in a crisis, the bond allocation rises and softens the loss. Diversification happens almost automatically.

Why This Time Is Different

The current crisis differs from earlier ones in one crucial way: it is a supply shock, not a demand shock.

Most financial crises, recessions, banking crises, pandemics, are demand shocks. People and companies cut spending, the economy slows, inflation falls, and the Federal Reserve can cut rates. In that environment, bonds rise: lower rates raise bond prices, and low inflation preserves real returns.

The current crisis begins with an oil shock: the Strait of Hormuz is blocked, and oil has jumped to $110-115 per barrel. That is a supply shock. It raises production costs, lifts consumer prices, and fuels inflation rather than lowering it. At the same time, it slows economic growth, because expensive energy acts like a tax on everything.

The result is stagflation: slower growth combined with faster inflation. That is the worst combination for a central bank. The Fed cannot cut rates without risking even higher inflation, but it also cannot raise rates without risking deeper damage to an already weakening economy.

In a stagflation scenario, inflation expectations dominate expectations of rate cuts. The bond market prices in higher inflation and therefore demands higher yields to compensate for the erosion of future coupon payments. Higher yields mean lower bond prices.

A CNBC report documented this phenomenon back in early March: yields on UK gilts, German bunds, and French OATs were moving in the same direction, even though the classic safe-haven pattern would normally imply falling yields across all of them.

Why Foreign Investors Are Also Selling Treasuries

The oil effect is not the only reason. The New York Fed recorded deteriorating liquidity in the Treasury market as far back as April 2025, before the current conflict even began.

There is another systemic factor: the US budget deficit exceeds $2 trillion per year. To finance it, the Treasury has to keep issuing new bonds. The market is increasingly asking: who is going to buy all this debt? If foreign central banks, China, Japan, Saudi Arabia, are cutting their Treasury holdings, and there are signs they are, then attracting new buyers requires higher yields.

External buyers are being partially replaced by domestic ones, American banks, pension funds, and money-market funds. But the domestic market has limited capacity at current rates. The equilibrium price is a higher yield.

What the Breakdown of 60/40 Means

If bonds do not protect against falling stocks and instead fall as well, the classic diversification logic stops working. This already happened in 2022, when the Fed raised rates aggressively because of post-pandemic inflation and both stocks and bonds dropped together, causing double-digit losses for 60/40 portfolios.

The current environment repeats 2022, but from a different starting point. Back then, inflation came from excess demand after COVID stimulus. Now it comes from the oil shock and tariff escalation. The mechanism is different, but the result for bonds is the same: they no longer serve as a safety cushion.

For investors used to thinking, "I hold both stocks and bonds, so I am protected," this requires a rethink. Diversification between stocks and bonds protects against one type of risk, recession plus lower rates, but not against another, stagflation plus higher rates.

Which Assets Traditionally Protect During Stagflation

If the classic 60/40 model breaks, the next question is obvious: what actually protects capital?

The historical experience of the 1970s is the richest source of precedent. During the OPEC oil shocks of 1973 and 1979, the best performers were:

• Gold, which rose several times over during the stagflation decade.
• Oil and gas companies, which directly benefited from expensive oil.
• Real estate, which together with other hard assets helped preserve value against monetary erosion.
• Commodities broadly, including metals, agriculture, and energy.

Bonds in the 1970s produced some of the worst real, inflation-adjusted, returns of the entire 20th century. Stocks did better, but they also suffered. Diversification helped only those who understood what kind of risk they were trying to hedge.

Notice what is already happening now: gold has set new records, and oil stocks are rising. That is a direct expression of what the market currently values as protection.

What This Means for Ukrainian Investors

For Ukraine, the Treasury situation has several indirect but very real consequences.

The cost of external financing. A large share of Ukraine's external debt, and the debt of developed-country donors, is denominated in dollars and linked in one way or another to Treasury yields as the base rate. If the 10-year yield rises, the cost of new borrowing for sovereign issuers rises with it.

Risk for emerging markets. Higher Treasury yields mean a higher "risk-free rate" against which all risky assets are valued. That puts pressure on domestic government bond spreads, Eurobonds, and broader investor appetite for Ukraine-related risk.

Hryvnia savings and the currency decision. If you hold savings in dollars and plan to "hide" in Treasuries or US bond ETFs, the current environment is a reminder that the dollar and Treasuries are not synonyms for protection. The dollar can weaken while Treasuries fall at the same time.

Practical Takeaway

The breakdown in the correlation between stocks and bonds is not a permanent market condition. It is typical of a specific kind of crisis: stagflation driven by supply shocks. When inflation returns to target or the Fed can restart a rate-cutting cycle, the classic defensive role of bonds will likely return.

But until then, a few practical points matter:

• Do not treat "bonds" as a synonym for "protection." The type of bond and the macro environment matter as much as the simple fact of owning bonds.
• The 10-year Treasury yield is the key indicator. If it moves toward 4.5% or higher, pressure on risky assets will intensify.
• Diversify across asset classes, not just between stocks and bonds. Real assets, real estate, gold, commodities, currently provide better protection than traditional fixed-income instruments.

Summary

Rising Treasury yields during a geopolitical conflict are not a market mistake. The market is reflecting reality correctly: an oil shock raises inflation expectations, and higher inflation expectations require higher yields as compensation. The 60/40 model, which works well in demand-shock recessions, breaks down in supply-shock stagflation.

For investors, the key lesson is this: do not build a portfolio around a single scenario. Diversification that protects against recession may fail to protect against stagflation, and vice versa. Understanding which assets defend against which kind of crisis matters more than any specific allocation decision.