Iran said it will step up efforts to tackle problems created by the U.S. sanctions that are crippling its economy, while a senior Iranian official warned of a "painful response" if it comes under further attack.Six months after U.S.-Israeli strikes against Iran, the war appears to be at a stalemate. A preliminary ceasefire accord reached in June has unravelled and little progress has been made in diplomatic efforts to get the peace process back on track.After a pause in military action for muc...
