Hong Kong (AFP) - Stock markets were mixed on Monday as oil prices fell after Donald Trump announced an “energy ceasefire” between Russia and Ukraine, which offset a fresh wave of Houthi attacks on Saudi Arabia.

Both main crude contracts sank more than one percent at one point following the US president’s declaration, even as it sparked astonishment in Kyiv, which also said Moscow had struck multiple power plants in the country.

“Effective immediately, there is an ENERGY CEASEFIRE in the War between Russia and Ukraine,” Trump said on Truth Social early on Sunday. “Both parties have agreed. Do not break it!”

His post came after he called on Ukrainian President Volodymyr Zelensky to halt attacks on Russian refineries and said it was “time for Ukraine to get a new president” who would finally settle the war.

Zelensky appeared to express surprise at the announcement, saying he was seeking further details, but added that “Ukraine supports the ceasefire, and it is important that Russia support it as well”.

Russia has yet to confirm its agreement.

While the announcement was welcomed by Ukraine’s allies, Trump had come under fire after declaring a temporary easing of US sanctions on Russian diesel, which European leaders and Kyiv said would only embolden Russian President Vladimir Putin.

The drop in oil prices reversed an initial spike that came in response to Houthi attacks on Saudi Arabia at the weekend.

At least a dozen people were killed at Riyadh’s international airport on Saturday – the deadliest attack on Saudi soil for more than a decade – and another person died following a second strike on Sunday.

The assaults marked a sharp escalation in the Yemen war, where Riyadh has long militarily supported the internationally recognised government against the Houthis.

The Iran-backed group claimed multiple attacks over the past 24 hours and threatened on Sunday to keep targeting the kingdom’s transit hubs, calling them “a theatre of operations for our forces”.

- ‘Useful signal’ -

“The market is no longer paying full geopolitical premium on every headline, and that is probably the most useful signal in the morning price action,” wrote SPI Asset Management’s Stephen Innes.

“A strike matters if it threatens real barrels, shipping lanes, refining capacity or insurance costs; otherwise, the market is getting increasingly reluctant to pay up simply because the geopolitical ticker flashes red.

“The physical market remains tight enough to keep Brent above $100, but futures are refusing to treat every new escalation as the start of another straight-line inflation shock.”

Asian markets enjoyed a healthy start to the day, but the rally petered as the day wore on.

Hong Kong, Sydney, Singapore, Wellington and Manila all rose, but Seoul and Taipei were dragged by losses in chipmakers SK hynix, Samsung and TSMC.

There were also losses in Shanghai, Mumbai, Bangkok and Jakarta.

US futures were sharply higher, while London, Frankfurt and Paris opened higher.

Tokyo was closed for a holiday.

Investors are also gearing up for the release of key US inflation and retail sales data, which could play a big role in the Federal Reserve’s decision-making regarding interest rates. The bank is due to meet at the end of October.

Also in view is the beginning of earnings season this week, with banking giants JP Morgan, Goldman Sachs and Bank of America due to report.

Tech giants will follow later in October and November, with traders keen to get an idea on the outlook for the AI sector in light of the vast sums of cash pumped into it in recent years.

- Key figures at around 0810 GMT -

Hong Kong - Hang Seng Index: UP 0.3 percent at 24,271.20 (close)

Shanghai - Composite: DOWN 0.4 percent at 3,794.60 (close)

London - FTSE 100: UP 0.6 percent at 10,613.47

Tokyo - Nikkei 225: Closed for a holiday

West Texas Intermediate: DOWN 0.8 percent at $91.09 per barrel

Brent North Sea Crude: DOWN 0.5 percent at $104.17 per barrel

Euro/dollar: UP at $1.1204 from $1.1203 on Friday

Pound/dollar: UP at $1.3243 from $1.3240

Dollar/yen: UP at 158.42 yen from 158.27 yen

Euro/pound: DOWN at 84.56 pence from 84.62 pence

New York - Dow: UP 0.8 percent at 51,654.95 (close)