Oil rose above $111 a barrel on Friday in a volatile session as fears over disruption to Russian oil exports in the face of Western sanctions offset the prospect of more Iranian supplies in the event of a nuclear deal with Tehran. Signs of an escalation in the Russia-Ukraine conflict, with reports of a fire at a Ukrainian nuclear power plant, spooked markets before authorities said the fire in a building identified as a training center had been extinguished. read more Brent crude rose as high as $114.23 a barrel and by 0920 GMT was up 63 cents, or 0.6%, at $111.09. U.S. West Texas Intermediate (WTI) added 64 cents, or 0.6%, […]