Japanese Prime Minister Shinzo Abe and visiting Vietnamese President Truong Tan Sang agreed on Tuesday to enhance their maritime security cooperation. "The two sides affirmed that peace and stability at sea were in the common interest of both countries as well as of the international community," dpa quoted the leaders as saying in a joint statement. The leaders also agreed to boost cooperation in the field of nuclear power generation and to work to achieve the goal of doubling two-way trade and investment by 2020, the statement said.