MOSCOW (Reuters) -Ukraine has suspended Russian oil pipeline flows to parts of central Europe since early this month because Western sanctions prevented it from accepting transit fees from Moscow, Russian pipeline monopoly Transneft said on Tuesday. International benchmark Brent crude jumped by $2 per barrel to trade near $98 as the news added to energy supply concerns, but turned negative later in the day. [O/R] Europe is heavily reliant on Russian crude, diesel, natural gas and coal. Energy prices have rallied this year on short supply as Europe scrambles to replace Russian energy with alter…