Iran and Afghanistan, as well as Pakistan, are bound in a sort of "strategic geography" in which their security, economic and social well-beings are deeply interdependent and their geopolitical fates are strongly linked. Therefore, Tehran has an interest in a strong and stable Afghanistan. This is for several reasons. An unstable Afghanistan could threaten the stability of Iran, above all in those provinces bordering the Afghan western regions. Such instability could spill over the boundaries and affect Iranian security. This instability could also lead to future waves of refugees in Iran, and Tehran perceives it as a key threat for its social stability and economic tenure. Moreover, Tehran wants a stable Afghanistan in order to combat drug trafficking.