By Balazs Koranyi and Francesco Canepa PARIS (Reuters) – The European Central Bank’s chief economist Philip Lane has told fellow policymakers that the Ukraine conflict may reduce the euro zone’s economic output by 0.3%-0.4% this year, four people close to the matter told Reuters. This was the “middle scenario” presented by Lane at a Governing Council meeting in Paris on Thursday, hours after Russia invaded Ukraine and as the ECB is grappling with how the crisis may affect its plans to withdraw monetary stimulus measures. Lane also presented a severe scenario where GDP is reduced by close to 1%…