London: Brent crude oil rose towards $110 (Dh404.03) a barrel on Monday, close to a seven-week high, as tensions mounted in eastern Ukraine and Libya delayed the reopening of a damaged eastern port.

US President Barack Obama announced new sanctions against some Russians on Monday aimed at stopping President Vladimir Putin from fomenting rebellion in eastern Ukraine but said he was holding broader measures against Russia’s economy “in reserve”.

In eastern Ukraine, pro-Moscow rebels seized public buildings in another town. Interfax news agency reported the mayor of a major eastern city, Kharkiv, had been shot and was undergoing an operation.

June Brent was up 22 cents at $109.80 a barrel by 1140 GMT, after settling down 75 cents on Friday.

US crude for June delivery added 50 cents to $101.10 a barrel, reversing some of its losses from Friday, when it hit its lowest since April 7.

Western sanctions are likely to steer clear of energy as Europe depends heavily on Russia for oil and gas. But Moscow has indicated a willingness to use gas supplies to pressure Ukraine, raising fears that oil flows could also be affected.

“The Brent price is likely to find continued support from the uncertainty over the way the situation will play out in east Ukraine and from the possibility of delivery outages,” said Carsten Fritsch, senior oil and commodities analyst at Commerzbank in Frankfurt.

Russia’s oil pipeline monopoly Transneft has said it is worried Ukraine may take control of its oil product pipeline to Hungary.

“Russia has shaken up the global energy scene by showing its willingness to employ energy as a political weapon,” said David Hufton, managing director of London-based brokerage PVM Oil Associates.

“The world’s largest energy supplier and exporter has reminded customers that it is not a reliable source of supply.”

In Libya, the government is assessing damage at the eastern oil port of Zueitina following an eight-month oil blockade.

Zueitina is one of two ports due to reopen after the government struck a deal with rebels three weeks ago.

US crude narrowed the gap with Brent to around $8.70 a barrel after it stretched as wide as $9.28 on Friday.

Analysts blamed record high crude inventories in the United States for depressing US crude prices despite a rise in refinery utilisation rates.