Behind the olive branchNorth Korea has a lot to gain by participating in the Olympics.
It's clearly hoping to get a much-needed breather after a year of intense political and military tensions. It has already scored one victory - massive annual joint US-South Korean military exercises that it believes are a dress-rehearsal for an invasion have been postponed until after the games are over. North Korea is now demanding the manoeuvres, which regularly lead to heightened tensions as both sides rev their militaries up to maximum readiness, be called off permanently.
Washington isn't buying.
The US position is that the exercises are an essential part of assuring that American and South Korean troops are ready and capable of defending against a North Korean incursion. But a smooth Olympics would put North Korea in a better position to win wider support, particularly in the South, for its claim that the wargames shouldn't be considered sacrosanct.
Barring a major incident, North Korea can also pick up some diplomatic points simply by joining in a big, global event. Its athletes, cheering groups and musical performances are a great vehicle for generating good will among South Koreans - and millions of Olympic viewers around the globe - who will be watching and hoping to see the Olympic spirit produce positive signs of a Korean rapprochement.
In the long term, if North Korea can keep the detente going, its economy could benefit from more engagement with the South. Officials are already hinting that they are very interested in wooing South Korean tourists. Skiers from the North and South on Thursday completed a joint training session at the Masik Pass ski resort, one of the spots North Korea most wants to promote.
Hot heads, cold feet?Almost as soon as Kim suggested sending a delegation to the Olympics, North Korea's media turned up its anti-Trump, anti-US rhetoric.
Of course, it's no big surprise to find anti-US rhetoric in the North Korean media. But the North is unusually concerned about what Trump's next moves might be and whether he is seriously considering a military option.
That concern has been pretty clear from its now almost-daily diatribes against Washington's deployments of two and possibly three aircraft carriers and their battle groups to the region and the positioning of strategic bombers on the Pacific island of Guam.
"The US is bringing dark clouds of a nuclear war to the peninsula over which doves should fly, revealing that it is the heinous enemy of peace and a war maniac which should not exist on the Earth," said a typical commentary on Thursday in the ruling party newspaper.
Reading between the lines, one likely motivation for the heightened verbal campaign is to tell Washington it will not let down its guard during the games. Another motive is to try to gain sympathy in Seoul - along with Beijing and Moscow - for the argument that the US, not North Korea, is the threat to peace and stability in the region.
Not all South Koreans, meanwhile, are happy about North Korea's Olympic overtures.
Large-scale protests, especially if they involve burning Kim in effigy, could be a deal-breaker for North Korea. Its barrages against anti-North elements in the South began in earnest after that very thing happened during a visit of one of its advance teams to Seoul.
If a similar incident were to occur again, the North has suggested it may pull out and go home.
Controlling the messageSouth Korea is the Olympic host, but North Korea may get the opening spotlight.
Not long after Kim made the Olympic offer, the North announced it will hold a major military event in Pyongyang, its capital, on February 8, the day before the games begin. Officials refuse to confirm details, but it will likely be a mass rally and military parade. What kind of weaponry it will put on display remains a secret, but such events are scrutinised closely by military experts and are guaranteed to receive big media coverage around the world.
To further control what the world sees, North Korea appears to have considered but then decided to deny access to journalists and photographers who are not based in the North.
It isn't clear how much of the Olympics North Koreans will be able to see. Live broadcasts are unlikely and only a trickle of information about the country's athletes and delegates to South Korea has been reported so far. Repeated requests by the Associated Press to interview athletes, officials or any members of the delegation were refused.
Athletes from North Korea have been increasingly competing abroad since Kim Jong Un assumed power in late 2011 and defections are unheard of. But with several hundred people expected to go to the Olympics - including an orchestra, singers, dancers, a taekwondo demonstration team and an all-female cheering group - North Korea will be hard-pressed to avoid the "ideological contamination" that might result from too much exposure to the South's affluence and social freedoms.
Judging by past precedent, they can all expect to be kept on a very short leash.
- AP