US Secretary of State Rex Tillerson is in Ukraine to reaffirm American support as the country struggles with a Russia-backed insurgency in the east and attempts to crack down on corruption.<br/>Mr. Tillerson will meet Ukrainian President Petro Poroshenko today. <br/><br/>His short visit to Kiev comes as the U.S. explores takinga greater role in a European-led effort to end the three-year conflict in Ukraine's east that has claimed around 10,000 lives. Russia annexed the Crimean Peninsula from Ukraine in<br/>2014.