North Korea has held a military parade attended by leader Kim Jong-un, a day before the opening of the Winter Olympics in the South.

The North often boasts of its parades but reports of this surfaced afterwards with TV only airing delayed footage.

This event is usually held in April and moving it had been seen as a setback to the warming of ties over the Olympics.

But the South announced on Thursday its president would meet the North’s Olympics delegation on Saturday.

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Moon Jae-in will have lunch with the 22-strong team, which will include the North’s ceremonial head of state, Kim Yong-nam, and Kim Yo-jong, the influential sister of Kim Jong-un who will become the first member of the ruling dynasty to visit the South. Both were at the parade.

What do we know about the parade?

Early on Thursday state TV began showing patriotic films in what appeared to be a prelude to a live broadcast.

But delayed and unscheduled footage of the event only appeared on TV in the North at 17:30 local time (08:30 GMT).

The parade was reportedly smaller than recent years and the footage showed Kim Jong-un inspecting troops, alongside his wife Ri Sol-ju. There was the traditional goose-steeping and a show of heavy weapons.

Mr Kim said the North had become a “world-class military power”.

The annual parade, which this year marks the 70th anniversary of the foundation of the Korean People’s Army, is normally held in April and this was the first time in 40 years it had been given a February date.

Such parades are often given a much higher profile. In 2017, North Korea aired a live broadcast of its military parade on state television. Foreign journalists were invited to cover the event.

South Korean government officials said last month that some 13,000 troops and 200 pieces of equipment had been spotted near an airport in Pyongyang in what appeared to be a rehearsal for the parade.

What was on show?

The main interest came at the end when the big missiles were rolled out.

The Hwasong-14 intercontinental ballistic missile was on show but it was the sight of four Hwasong-15s that caught the eye of observers. Both were being paraded for the first time.

It was the testing in November of a Hwasong-15, which with its range of 13,000km (8,077 miles) could reach any part of the continental US, that sparked a new round of sanctions.

Dave Schmerler, of the James Martin Center for Nonproliferation Studies, said an interesting point was that the parade did not show anything that was untested, unlike some previous events.

Why hold the parade now?

The North had insisted on the event, despite criticism from the US and others about its timing – a day before the opening ceremony of the Winter Olympics, which run from 9 to 25 February in the mountain town of Pyeongchang.

It had appeared to be a setback to the rapprochement with the South over the Games, which has generally seen a political charm offensive by the North.

But commentators in the South said avoiding live TV coverage may have been an attempt to keep the parade low key.

The parade is not the only challenge the apparent warming of ties has faced.

There has been criticism in the South about a joint women’s ice hockey team, and the North cancelled a pre-Olympics cultural event, citing media bias in the South.

How the attendance of the North’s delegation fits in with international sanctions and blacklists has also been a problem.

South Korea has had to ask the UN for an exemption to allow Choe Hwi, a UN sanctioned North Korean official, to attend.

How is the political detente going?

The Games will see both Koreas march under one flag at Friday’s opening ceremony.

The South said President Moon would meet the North’s team on Saturday, although no location was given.

The top officials from the North will arrive by plane on Friday.

Most of its 280-strong delegation, including 229 cheerleaders, four officials from the National Olympic Committee, 26 taekwondo demonstrators and 21 journalists. arrived via a border crossing on Wednesday.

On Thursday, North Korea said it had no intention of meeting US officials during the event.

Who is representing the US at the Games?

Vice-President Mike Pence arrived in South Korea on Thursday and met President Moon later in the day.

Mr Moon said the “most important thing is close co-operation between South Korea and the United States” and that the US’s “firm stance” had created the opportunity for North-South dialogue.

The US has been sceptical of the North’s actions. Mr Pence said earlier he wanted to “make sure North Korea doesn’t use the powerful symbolism in the backdrop of the [Games] to paper over the truth about their regime”.

He also said the US would soon unveil “the toughest and most aggressive round of economic sanctions on North Korea ever”.

Although he did not close the door to talks, saying there was the “possibility for any kind of an encounter”, he said he would tell the North it would need to “once and for all abandon its nuclear and ballistic missile ambition”.

It has now been confirmed Kim Jong-un’s sister will attend Friday’s opening ceremony.

The BBC’s Laura Bicker in Seoul says this could provide a diplomatic headache, as Mr Pence will be there with the father of Otto Warmbier, who died after being imprisoned in North Korea.

Some of the sport is already under way, ahead of the opening ceremony, including in curling, ski jumping and figure skating.