CHICAGO, Jumada II 29, 1433, May 20, 2012, SPA - Pakistani President Asif Ali Zardari arrived in Chicago on Saturday for a NATO summit, which begins on Sunday. "We can't solve the problems in Afghanistan without a positive engagement of Pakistan," NATO Secretary-General Anders Fogh Rasmussen said hours before Zardari's arrival. Zardari accepted at the last minute an invitation to attend the Summit in U.S. President Barack Obama's home town, according to a report of the Associated Press. --SPA 13:17 LOCAL TIME 10:17 GMT www.spa.gov.sa/1000102