South Korea is not allowed to enrich uranium or develop traditional uranium enrichment technology on its own, because of US political pressure, unlike most major nuclear powers such as Japan, Germany, and France, competitors of South Korea in the international nuclear market. This impediment to South Korea's indigenous nuclear industrial undertaking has sparked occasional diplomatic rows between the two allies. While South Korea is successful in exporting its electricity-generating nuclear technology and nuclear reactors, it cannot capitalize on the market for nuclear enrichment facilities and refineries, preventing it from further expanding its export niche. South Korea has sought unique technologies such as pyroprocessing to circumvent these obstacles and seek a more advantageous competition. The US has recently been wary of South Korea's burgeoning nuclear program, which South Korea insists will be for civilian use only.