Around 90% of the Ch'ŏnma-ho is indigenously produced. There is evidence, however, that North Korea has purchased entire engines, or engine components, from Slovakia. Furthermore, it is thought that ceramic components, possibly for an upgraded armour scheme, are from foreign sources, as well as fire control components. It is not clear how much is indigenously produced in regards to the different variants of the Ch'ŏnma-ho. The figure of 90% could have changed considerably between the original Ch'ŏnma-ho I and the Ch'ŏnma-ho V, although it should be kept into consideration that many of the major features are probably purchased from abroad – especially for the upgrades of the tanks. It is not clear how much North Korea can afford on producing on its own, or how much it can afford to import for that matter. It is thought that North Korea is considerably low on resources, especially money, and this belief has been perpetuated after North Korea's nuclear test incidents in 2006. It is possible that Russia is supplying North Korea with several components for North Korea's tank projects which include the Ch'ŏnma-ho and quite possibly the M-2002, although no hard evidence can support this claim.