President Donald Trump has said that he believes China's president has been putting pressure on North Korea as it pursues its missile and nuclear weapons programmes - but when asked about whether another nuclear test would mean a military response from the US, Mr Trump said "I don't know...we'll see".

In an interview with CBS programme Face the Nation Mr Trump said he won't be happy if North Korea conducts a nuclear test and that he believes Chinese President Xi Jinping won't be happy, either.

Asked if that means military action, Mr Trump responded: “I don't know. I mean, we'll see.”

Asked about the failure of the recent missile tests, Mr Trump said: “Perhaps they're just not very good missiles. But eventually, he'll have good missiles.”

Refusing to elaborate on US military options because “we shouldn't be announcing all our moves”, Mr Trump added: “It is a chess game. I just don't want people to know what my thinking is.”

He called the North Korean leader Kim Jong-Un “a pretty smart cookie” for being able to hold onto power after taking over the reclusive Asian nation at a young age.

“People are saying, 'Is he sane?' I have no idea.... but he was a young man of 26 or 27... when his father died, " Mr Trump said. He's dealing with obviously very tough people, in particular the generals and others.

”And at a very young age, he was able to assume power. A lot of people, I'm sure, tried to take that power away, whether it was his uncle or anybody else. And he was able to do it. So obviously, he's a pretty smart cookie,“ Mr Trump added.

On Saturday, a North Korean mid-range ballistic missile apparently failed shortly after launch, the third test-fire flop this month but a clear message of defiance. North Korean ballistic missile tests are banned by the United Nations because they're seen as part of the North's push for a nuclear-tipped missile that can hit potentially the US mainland.

In pictures: North Korea military drill Show all 8 1 /8 In pictures: North Korea military drill In pictures: North Korea military drill North Korea's leader Kim Jong Un watches a military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS In pictures: North Korea military drill A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) is seen in this handout photo by North Korea's Korean Central News Agency (KCNA) KCNA/Handout via REUTERS In pictures: North Korea military drill A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) is seen in this handout photo by North Korea's Korean Central News Agency (KCNA) KCNA/Handout via REUTERS In pictures: North Korea military drill A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS In pictures: North Korea military drill A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS In pictures: North Korea military drill This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video In pictures: North Korea military drill This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video In pictures: North Korea military drill This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video

The launch comes at a point of particularly high tension in the region. Mr Trump has sent a nuclear-powered submarine and the USS Carl Vinson aircraft carrier to Korean waters and North Korea last week conducted large-scale, live-fire exercises on its eastern coast. The U.S. and South Korea also started installing a missile defence system that is supposed to be partially operational within days and their two navies are staging joint military drills.

Residents in the village of Seongj, where the missile defence system is being installed, scuffled with police on Sunday. About 300 protesters faced off against 800 police and succeeded in blocking two US Army oil trucks from entering the site, local media reported. A few residents were injured or fainted from the scuffle and were transported to a hospital.

The Terminal High-Altitude Area Defence system (THAAD), remains a controversial topic in South Korea and presidential front-runner Moon Jae-in even has vowed to reconsider the deployment if he wins a presidential election in May. He has said that the security benefits of THAAD would be offset by worsened relations with China, which is the country's biggest trading partner and is opposed to its deployment.

Mr Trump raised eyebrows in South Korea last week when he said would make Seoul pay $1 billion for the missile defence system. Seoul's presidential Blue House said on Sunday that White House National Security Adviser HR McMaster confirmed that the U.S. will not be seeking money for the system.

North Korea didn't immediately comment on its latest missile launch, though its state media has reiterated the country's goal of being able to strike the continental U.S.

South Korea's Foreign Ministry denounced the launch as an “obvious” violation of United Nations resolutions and the latest display of North Korea's “belligerence and recklessness.”

“We sternly warn that the North Korean government will continue to face a variety of strong punitive measures issued by the UN Security Council and others if it continues to reject denuclearisation and play with fire in front of the world,” the ministry said.

Donald Trump warns ‘major, major conflict’ with North Korea is ‘absolutely’ possible

South Korea's Joint Chiefs of Staff said in a statement that the missile flew for several minutes and reached a maximum height of 44 miles (71 kilometres) before it apparently failed.

It didn't immediately provide an estimate on how far the missile flew, but a US official, speaking on condition of anonymity to discuss sensitive matters, said it was likely a medium-range KN-17 ballistic missile. It broke up a few minutes after the launch.

Japan's Chief Cabinet Secretary Yoshihide Suga, speaking after a meeting of Japan's National Security Council, said the missile is believed to have travelled about 30 miles and fallen on an inland part of North Korea.

Analysts say the KN-17 is a new Scud-type missile developed by North Korea. The North fired the same type of missile on 16 April, just a day after a massive military parade where it showed off its expanding missile arsenal, but US officials called that launch a failure.

Some analysts say a missile the North test-fired on 5 April, which US officials identified as a Scud variant, also might have been a KN-17. That missile is said to have spun out of control and crashed into the sea.

Moon Seong Mook, a South Korean analyst and former military official, says that the North would gain valuable knowledge even from failed launches as it continues to improve its technologies for missiles. The South Korean and Japanese assessments about Saturday's launch indicate that the North fired the missile from a higher-than-normal angle to prevent it from flying too far, he said.

“They could be testing a variety of things, such as the thrust of the rocket engine or the separation of stages,” Mr Moon said. “A failure is a failure, but that doesn't mean the launch was meaningless.”

The two earlier launches were conducted from an eastern coastal area, but Saturday's missile was fired in the west, from an area near Pukchang, just north of the capital, Pyongyang.

Pope Francis warned that “a good part of humanity” will be destroyed if tensions with North Korea escalate, and he called for diplomacy and a revived United Nations to take the lead in negotiating a resolution.

Pope Francis was asked as he travelled back to Rome from Egypt about North Korean ballistic missile tests and U.S. warnings of “catastrophic” consequences if the world fails to stop them.

“Today, a wider war will destroy not a small part of humanity, but a good part of humanity and culture. Everything. Everything, no? It would be terrible. I don't think humanity today could bear it,” he said.