The three countries are slightly different. Both Russia and China did build their first SMRs.
The Russian design was a so-called floating power plant, where the nuclear reactor was located on a barge. It was meant to serve as a way to electrify remote communities in Russia, which were on the Arctic coast. This was built. It was over a decade late. It was about three times as expensive as the initial cost estimates. That's the primary reason they haven't had any customers. There are many countries that would say that they would like one of these things. Indonesia is one that I mentioned. They said they have large numbers of islands and it would be great to have a floating power plant, but when they see the experience and the cost, they don't really want to go there.
In China's case, they actually built a high-temperature, gas-cooled reactor, which was based on earlier experience in Germany. This reactor, too, was about four years late. The cost was estimated to be 40% higher than the cost of electricity from light-water reactors in China. As a result, the plans they had to build more of these high-temperature gas-cooled reactors are being shelved. They talk about trying to make it larger, so that they can try to reduce the cost through economies of scale, which basically means that they are no longer talking about small modular reactors, but of large reactors.
In the case of South Korea, its SMART design was licensed for construction in 2012. They looked around South Korea, and not a single utility wanted to build one of these. Therefore, South Korea is looking for export markets. They're talking about Saudi Arabia and Jordan, but none of them have actually bought one so far.