Oil prices climbing toward $100 a barrel have renewed concern that inflation could stay elevated for longer, adding fresh pressure to European financial markets. The move came as the European Central Bank kept interest rates on hold, a backdrop that left investors focused on whether higher energy costs could complicate the fight against rising prices.

The latest jump in crude has raised worries because more expensive oil can feed through to transport, production and household costs. That creates a risk that inflation, which central banks have spent months trying to cool, may prove harder to bring down if energy prices keep moving higher.

In markets, the shift in inflation expectations pushed Europe’s government borrowing costs to long-term highs. Rising borrowing costs often reflect investor concern that interest rates may need to stay elevated for longer, even when central banks pause after an aggressive tightening cycle.

The combination of stronger oil prices, renewed inflation anxiety and higher bond yields highlights the difficult balance facing policymakers. With the ECB holding rates steady, attention is now turning to whether energy-driven price pressures become a temporary shock or a broader challenge for Europe’s inflation outlook.