Oct 9 (Reuters) - The rouble slumped to a more than 18-month low against the dollar on Monday past the 102 mark, still hampered by reduced foreign currency supply and struggling to latch on to higher oil prices as the violence in Israel hurt risk appetite.
Israel's troops were battling on Monday to clear out Hamas gunmen more than two days after they burst across the fence from Gaza on a deadly rampage, and the army said it would soon go on the offensive after the biggest mobilisation in Israeli history.
By 1125 GMT, the rouble was 1.8% weaker against the dollar at 102.18, its weakest point since March 23, 2022. The Russian currency tumbled to a record low 121.5275 in the weeks after Moscow's February 2022 invasion of Ukraine.
The rouble had lost 1.9% to trade at 107.76 versus the euro and shed 2.1% against the yuan to 14.01 .
The rouble's last tumble into triple digits in August led the Bank of Russia to make an emergency 350 basis-point rate hike to 12% and authorities to discuss reintroducing controls to buttress the currency, but interventions - verbal or otherwise - have been more limited this time around.
Rates were lifted to 13% in September and analysts polled by Reuters expect the central bank to hike again on Oct. 27, with persistent rouble weakness among the factors limiting Russia's long-term growth prospects.
Brent crude oil, a global benchmark for Russia's main export, was up 3.4% at $87.46 a barrel, lifted by the military conflict in the Middle East.
Russia's finance ministry's expects tax revenues from energy companies to rise in October.
"If these forecasts come true, then oil companies will have to sharply increase the volume of sales of FX revenues for settlements with the budget," said Alor Broker's Alexei Antonov.
He said that exporters were unlikely to limit FX sales until the end of the month, when taxes are due, meaning that the rouble could start recovering this week.
Russian stock indexes were mixed.
The dollar-denominated RTS index was down 0.5% to 981.9 points. The rouble-based MOEX Russian index was 1.3% higher at 3,184.6 points, a near one-month high. (Reporting by Alexander Marrow Editing by Angus MacSwan and Mark Potter)
