Iran’s geo-political position
Chabahar, only about 100 kilometres (62 miles) from the Pakistan border and located on the Indian Ocean, is Iran's largest port outside the Gulf and the only one exempt from USA sanctions.
That is due mainly to the pivotal role of the port, and a planned railway line, in breaking landlocked Afghanistan's dependence on Pakistan for trade with the world, especially with Pakistan's rival India.
Pakistan’s geo-political position
The USA’s geo-political position