During a pro-Ukrainian march, fights broke out with pro-Russians and police stepped into the fray, in Donetsk, Ukraine, April 28, 2014. The mayor of Ukraine's second largest city, Kharkiv, was seriously wounded by unidentified gunmen on Monday, and the Obama administration ordered travel bans and asset freezes for seven Russian officials, including two said to be in Mr. Putin’s inner circle, and froze assets for 17 companies.SERGEY PONOMAREV/The New York Times