Pakistani President Asif Ali Zardari will arrive in Riyadh on Wednesday for a two-day trip to the kingdom, meant to improve Pak-Saudi ties. Anti-terrorism campaign, security, stability, Iran and other regional issues are expected to dominate the talks that Zardari will hold. The trip, apparently planned at the last stage, wasn’t scheduled until recently. It comes as the regional focus on Tehran is growing. Diplomatic sources in Saudi Arabia believe that Iran will be the main topic of discussion during the president’s visit.