China already docked a submarine in Sri Lankan port that they were building in 2014 and later took the lease off. Sri Lanka later rejected the Chinese request o

China already docked a submarine in Sri Lankan port that they were building in 2014 and later took the lease off. Sri Lanka later rejected the Chinese request of docking a nuclear submarine. So, I think it is on case-by-case basis and if local government has curried favours with Chinese Government. They are building military infrastructure (listening posts already exist) in Myanmar's Coco Islands, and Maldives too, in their strategy to surround India which is called, "String of Pearls".