The rapid inter-Korean thaw has eased tensions that soared previous year when Pyongyang tested missiles that could reach the USA mainland and detonated what it said was an H-bomb.
But they entered the stadium separately for the Paralympics after failing to agree on which version of the united flag to use.
In the men's 7.5km sitting biathlon another American came out on top, with Daniel Cnossen winning gold.
There was also a positive reaction when one athlete from North Korea and one from South Korea held the Paralympic flame aloft together before handing it over to start a relay which culminated with a South Korean single-leg amputee abseiling up a ski slope before the cauldron was lit.
Man-U prepares for Sevilla without Pogba, Rojo, Herrera
Those who are looking for enhanced odds exclusives can have a look at Betfair's enhanced odds of United beating Huddersfield 25/1. They register one win on the road, but it was against a lowly Malaga side that can't get a win to save their lives at the moment.
They had originally been expected to march alongside their South Korean counterparts at Friday's opening ceremony but a row over how their "unification flag" should appear halted the plan.
A Korean amputee performer beat a giant drum on a freezing, foggy Friday night to celebrate the opening of the largest Winter Paralympics in history.
He told the Paralympians to keep fighting, play fair, have fun, and keep pushing their limits.
There was a silver lining, though, in the unity among the two torchbearers - one North Korean and one South Korean.
Federer on fire in Indian Wells
In other matches, fifth-seeded Dominic Thiem had to retire with an ankle injury while trailing Pablo Cuevas 6-3 4-6 2-4. After handing back an early break to allow Krajinovic to draw level at two-all, Federer moved into cruise control.
The first official Paralympic Games took place in 1960, in Rome, Italy, with 400 athletes representing 23 different countries.
During the Winter Olympics, the two Koreas marched under a unified flag that displayed Korea with a set of islands in the Sea of Japan, which are now the subject of a territorial dispute.
The participation of the North's wheelchair-bound athletes is part of a rapid rapprochement with the South that began at the Winter Olympics in February.
Three athletes have competed at every Winter Games since 2006: alpine skiers Laurie Stephens and Tyler Walker, and sled hockey goalie Steve Cash.
Kim Jong Hyon carries the flag of North Korea as he leads his teammates into the opening ceremony.
Police assessing second suspicious package at parliament in two days
A second package is also being looked at, they said - and one person has been taken to hospital this morning. It is understood there has been no evacuation but the affected area has been cordoned off.