Their countries may be at war, but gymnasts from North and South Korea have shown a rare moment of unity in the form of a selfie at the Rio 2016 Olympic Games.

South Korean gymnast Lee Eun-ju, 17, and her North Korean counterpart Hong Un-jong, 27, paused to snap a smiling picture together during a training period in Brazil, news.com.au reported.

The moment was captured by another photographer and tweeted by political scientist Ian Bremmer who said, "This is why we do the Olympics" about the display between citizens of the two countries that are technically at war.

His tweet has been retweeted and liked more than 21,000 times.

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North Korea has raised international tensions recently with nuclear testing and a barrage of missile launches that have reached into Japanese waters for the first time.

Pyongyang has also accused the US of "bluffing that they can mount a pre-emptive strike" on the country. It has repeatedly warned it would launch strikes against South Korea and the US.

But that tension could not be felt in the Rio training hall where the two competitors smiled for crowds. See the pictures below.

South Korean gymnast Lee Eun-ju, right, and her North Korean counterpart Hong Un Jong pose together. Photo / AP
South Korean gymnast Lee Eun-ju, right, and her North Korean counterpart Hong Un Jong pose together. Photo / AP
South Korea's Lee Eun-ju, left, smiles as she talks with North Korea's Hong Un Jong. Photo / AP
South Korea's Lee Eun-ju, left, smiles as she talks with North Korea's Hong Un Jong. Photo / AP