By Trevor Hunnicutt and Jarrett Renshaw KANKAKEE, Ill. (Reuters) -U.S. President Joe Biden on Wednesday blamed Russia’s war on Ukraine for the latest spike in global food prices and visited a family farm in Illinois where he pledged to support the nation’s farmers as they seek to fill the supply shortage. Biden said U.S. farmers have helped pull Americans through the COVID-19 pandemic and now the Ukraine crisis. “You are the backbone of freedom,” he said, following a tour of an 800-acre family farm in Kankakee owned by Jeff and Gina O’Connor. “Right now, America is fighting on two fronts. At h…