FTSE 100 slips as oil spikes on renewed US‑Iran tensions

FTSE 100 opened lower on Tuesday, dragged down by a jump in oil prices after the United States launched strikes on Iranian rocket launchers and Iran responded by targeting US bases in the region. Brent crude, the global benchmark, traded above $91 a barrel, extending gains from the previous session.

Market reaction

London’s equity market, returning from the Bank Holiday break, saw blue‑chip shares slide as investors priced in higher energy costs and heightened geopolitical risk. The sell‑off was broad, with defensive sectors under pressure despite the usual flight to safety in times of conflict.

Geopolitical backdrop

Last week the White House hinted at a shift from direct military action to intensified sanctions aimed at crippling the Iranian economy. President Donald Trump later told Fox News that the United States would "hit them hard" and described Iran as a failed nation without an air force, navy or currency.

"Fresh military operations are pushing the oil price higher, but the rally lacks the momentum needed to break previous highs," said Achilleas Georgolopoulos, senior market analyst at Trading Point.

Georgolopoulos added that expectations for progress in the US‑Oman‑Iran talks have taken another hit, leaving markets wary of further escalation.

Outlook

Analysts expect volatility to linger as both sides assess the next steps. If the conflict widens, oil could climb further, putting pressure on inflation‑sensitive economies. Conversely, a diplomatic breakthrough could stabilise prices and give the FTSE 100 a chance to recover.

Investors will be watching for any new statements from Washington, Tehran and regional allies, as well as data on oil inventories that could signal whether the market rally is sustainable.