According to Russian Defense Minister Sergei Shoigu, Russia would help Vietnam in submarine building and crew training.
And if I understand the news correctly, the next submarines will be built by Vietnamese shipyards.
“Within this year, the two countries’ common effort is to open a new page in the history of development of Vietnam’s navy,” Shoigu, who started his visit to Vietnam on March 4, said.
"We will join efforts to usher in a new development of the Vietnamese navy. Vietnam's submarine force is expected to be established this year," Shoigu said in visit to Vietnam last day.