Pakistan’s Arabian Sea port of Gwadar is perched on the world’s energy jugular. Sea lanes nearby carry most of China’s oil imports; any disruption could choke the world’s second-largest economy.

Owned, financed and built by China, Gwadar occupies a strategic location. Yet Islamabad and Beijing for years denied any military plans for the harbour, insisting it was a purely commercial project to boost trade. Now the mask is slipping.

“As Gwadar becomes more active as a port, Chinese traffic both commercial and naval will grow to this region,” says a senior foreign ministry official in Islamabad. “There are no plans for a permanent Chinese naval base. But the relationship is stretching out to the sea.”