U.S. and South Korea agree on more sanctions against Pyongyang

Pyongyang has said it would take action if a new Indo-Pacific alliance between the US, Australia and the UK had "even the smallest negative effect" on North Korea's security.

South Korea has said the North fired an unidentified projectile as Pyongyang's UN envoy defended the rogue country's right to test weapons. North Korea is currently under UN sanctions banning weapons tests.

Capable of traveling more than five times the speed of sound, a new generation of missile systems are being designed for speed, stealth and surprise. Russia is already working on developing its own weapons system.

North Korea's ambassador to the UN tells the General Assembly that "nobody can deny" the nuclear-armed country the right to test weapons. Kim Song's comments at the world body headquarters in New York come just moments after South Korea's military said the North had fired an "unidentified projectile" into the sea off its east coast.

Pyongyang last cut off the hotline in August after joint US-South Korea military drills. The move comes amid a series of weapons tests by the North.

North Korean leader Kim Jong Un said the US is the "root cause" of instability on the Korean Peninsula. He said Pyongyang is only increasing its military capabilities as a deterrent.

The military in South Korea has said the projectile was a submarine-launched ballistic missile. It comes as intelligence chiefs from the US, South Korea and Japan meet in Seoul.

A report in the "Financial Times" suggested China had launched a low orbit "missile" that could penetrate current defense systems. The Asian superpower said it was for "peaceful" usage.

North Korea has confirmed that it tested a new type of submarine-launched ballistic missile on Tuesday, making it the fifth in a round of missile tests by the country since September.

The US president has voiced his concern over China's missile capabilities as his nominee to be the next ambassador to the country said "we certainly cannot trust the Chinese" over the issue of Taiwan.

South Korea has launched its first domestically developed space rocket but failed to put its dummy payload into orbit, a setback in the country's attempts to join the ranks of advanced space-faring nations.