ASTANA: President Asif Ali Zardari and Iranian President Mahmoud Ahmadinejad here on Wednesday expressed their determination to continue close collaboration to further regional peace and stability.During a meeting on the sidelines of the summit of Shanghai Cooperation Organization (SCO), the two leaders held fruitful discussion on bilateral,regional and international issues of mutual concern.They said that in the spirit of good brotherly and neighbourly relations, Pakistan and Iran would explore new opportunities of economic cooperation. – APP