An agreement to end the war in Ukraine could transform Russia’s relations with North Korea. Moscow is unlikely to reduce its cooperation with Pyongyang to pre-2022 levels, but it may become more selective about areas

North Korea has conducted a slew of underwater-launched ballistic missile tests since 2016, but all launches were made from the same 2,000-tonne-class submarine which has a single launch tube. Many experts call it a test platform, rather than an operational submarine in active service.

The submarine could significantly escalate security concerns on the Korean peninsula and in the Taiwan Strait, experts say North Korea's construction of a nuclear-powered submarine could significantly escalate security concerns on the peninsula and in the Taiwan Strait,

Last week's accidental shelling of a South Korean village occurred less than 20 miles from the border of the nuclear-armed North.