Moon, Trump vow stronger pressure

US President Donald Trump and his South Korean counterpart have pledged "stronger pressure" on Pyongyang, Seoul said yesterday, after North Korea defied tough new sanctions with a missile test and said it wanted to match American nuclear strength.

In a phone conversation yesterday, South Korean President Moon Jae-In and Trump "gravely condemned" the latest missile test on Friday, which came just days after United Nations Security Council announced a raft of new sanctions against Pyongyang.

"The two leaders agreed on more practical and stronger pressure... to make the North Korean regime realise that further provocation will only bring stronger diplomatic isolation and economic pressure leading to a path of collapse," the South's presidential office said in a statement.

Pyongyang says it needs nuclear weapons to protect itself from "hostile" US forces and is determined to build a weapons system capable of delivering a nuclear warhead to hit the US mainland.

North Korean leader Kim Jong-Un, who oversaw the latest missile test, has said the launch increased the "combat power of the nuclear force", according to the North's official KCNA news agency.

He said the launch was part of the country's plan to achieve "equilibrium of real force" with the US.

Experts believe Pyongyang's weapons programme has made rapid progress under leader Kim Jong-Un, with previous sanctions having done little to deter it.