Iranian policy in Afghanistan

Much is being talked about Iran. And Afghanistan never goes off the papers' headlines. But Did you hear anyone talking about the Iranians in Afghanistan?
Afghanistan has always been one of the priorities of Iranian foreign policy. It is connected both with the common border and with the fact that Afghanistan is a part of the ancient Iranian-speaking world and it has long-standing cultural, economic and political ties with Iran. It is difficult to imagine any serious problem resolving in modern Afghanistan without active participation of Iran, moreover it is necessary to mention that problems of the Afghans has already become problems of the Iranian people...
http://www.eastwest-review.com/article/iranian-policy-afghanistan