New York's main contract, West Texas Intermediate (WTI) was up nine cents to $100.08 for June delivery in mid-morning Asian trading, while Brent North Sea crude for June gained 32 cents to $108.21 per barrel.
"With the risk of escalating geopolitical tensions in and around Ukraine... oil supplies could be disrupted," said Desmond Chua, market analyst at CMC Markets in Singapore.
