Our Friends, the Russians...

“Our key product in this global [third-world] market segment is the Project 636 submarine, which is the current bestseller. But we are also promoting the new Amur-1500 submarine,” said Rosoboronexport head Anatoly Isaykin.

“This is not a replacement for Project 636; it is an entirely new submarine that we will be promoting in parallel with Project 636. The Amur-1500 will also be in demand from international buyers, as it will be offered in different versions — including a version with an air-independent propulsion system that is becoming increasingly popular in the naval market,” Isaykin said.
http://rbth.ru/business/2013/01/22/russia_plans_to_sell_multipurpose_submarines_abroad_22111.html