Oil jumped more than two per cent on Wednesday after Russian President Vladimir Putin announced a partial military mobilisation, escalating the war in Ukraine and raising concerns of tighter oil and gas supply. Brent crude futures rose $2.28, or 2.5pc, to $92.90 a barrel by 0707 GMT after falling $1.38 the previous day. US West Texas Intermediate crude was at $86.16 a barrel, up $2.22, or 2.