Oil prices held above US$121 a barrel Friday in Asia after jumping more than US$5 overnight as investors mulled the likelihood that tension with Russia would further disrupt crude supplies to the West, AP reported. Light, sweet crude for October delivery was up 17 cents at US$121.35 a barrel in electronic trading on the New York Mercantile Exchange by midday in Singapore. The contract rose US$5.62 overnight to settle at US$121.18 a barrel.