FRANKFURT (Reuters) – Bank lending to euro zone businesses slowed in March, reinforcing expectations that Russia’s war in Ukraine would prompt both banks and corporations to tread cautiously, data from the European Central Bank showed on Friday. With the war in Ukraine sapping confidence, policymakers are increasingly worried that banks will tighten access to credit, weighing on an economy that is already likely to stagnate, at best, during the first half of the year. Growth in lending to businesses slowed to 4.2% in March from 4.5% a month earlier, a still healthy figure in line with pre-Covi…