Unlike South Korea's conventional diesel-powered submarines, which have to emerge out of the water for oxygen every three to four days, nuclear-powered submarines can engage in underwater missions for up to a year, unless they surface for their sailors or supplies.
Trump administration considering sanctions against Chinese companies trading crude oil with North Korea.
Many South Korean celebrities are starting to jump into the cafe, restaurant business following their unsteady employment and fluctuating income in the entertainment field.
North Korea's Foreign Ministry slams the most recent United Nations resolution passed against it, rejecting the sanctions and saying they are a "product of heinous provocation."
South Koreans are frustrated by latest conflict with Pyongyang.
US Ambassador to the UN Nikki Haley says her country was "not looking for war" with North Korea, as the UN Security Council unanimously passes new sanctions she says will "starve the regime" into stopping its nuclear programme.
North Korea's missile programme is a source of deep concern for the international community. The country's missile programme started with Soviet designed Scud missile, with its first batch reportedly coming via Egypt in 1976.
Japanese Prime Minister Shinzo Abe and South Korean President Moon Jae In agree to closely coordinate for new, tougher sanctions against North Korea, during talks in the far-eastern Russian port city of Vladivostok.
South Korean President Moon Jae in will meet Russian President Vladimir Putin today to discuss the issue. He is keen to leverage on Kremlin to break the nuclear impasse.
Asean rises as an important strategic partner to South Korea amidst President Moon's efforts to strengthen tie.