Kim Jong Un re-appointed leader of North Korea's ruling party

North Korea's ruling Workers' Party has again chosen Kim Jong Un to be its general secretary, state media report.

The announcement, which was made at a rubber-stamp party congress in Pyongyang on Sunday, comes as little surprise given the Kim family has ruled the dictatorship since the late 1940s.

State-run KCNA said that under Kim's leadership North Korea "radically improved" its "war deterrence", "with the nuclear forces as its pivot".

Despite long-standing international sanctions, North Korea has continued to build its nuclear capabilities, regularly testing banned intercontinental missiles. But the secrecy of the regime makes it harder to evaluate how much progress the military has made.

Kim, who took over control of the regime after his father's death in 2011, has invested heavily in the nuclear weapons programme, turning Pyongyang into a far bigger challenge for the West, and especially the US.

He is expected to announce the next phase of the country's weapons programme during the Ninth Congress of the Workers' Party of Korea, which began on 19 February and is now in its fourth day. Before it started, North Korea unveiled what it said was a range of nuclear-capable rocket launchers.

The congress has been held once every five years in the last decade.

With some 5,000 party members in attendance, according to KCNA, it offers a rare glimpse into the structure of political power in North Korea, which remains quite opaque even to the keenest watchers.

The meetings are considered to be the most important political event and provide insight into where the country's priorities lie, from foreign policy to its nuclear ambitions.

While Kim has remained at the top of North Korean leadership, the party congress' presidium, or executive committee, has been reshuffled since the last meeting in 2021. More than half of its 39 members have been replaced, according to state media.

In his opening speech last week, Kim vowed to boost the country's economy and people's standard of living, which he described as "heavy and urgent historic tasks".

All eyes are on whether Kim's daughter, Ju Ae, will make an appearance at the congress.

Earlier this month, South Korea's spy agency said that Kim had chosen Ju Ae as his heir. Kim Ju Ae, believed to be 13 years old, has become an increasingly prominent figure at official events - inspecting missiles and attending Beijing's military parade with her father.

On Monday, Chinese president Xi Jinping called Kim to congratulate him on his re-appointment, saying he would work with Kim to "write a new chapter in the China-North Korea friendship", Chinese state media reported.

Beijing has long been Pyongyang's most significant ally: it is Pyongyang's largest trade partner and source of aid.

But at the same time, China is wary of Pyongyang's nuclear ambitions, which could destabilise the region, and its growing ties with Vladimir Putin's Russia.