North Korea's record year of missile launches has shown its willingness to pour resources into producing and deploying more weapons than ever, supported in part by overseas networks that provide funding and material, analysts say.

Last week, the country fired more than 80 missiles, including its latest short-range ballistic missiles (SRBMs) and a new variant of intercontinental ballistic missile, by far the North's most launches in such a short period.

Although North Korean weapon costs are not known, ICBMs in other countries can cost tens of millions of dollars, and SRBMs such as Russia's Iskander up to $3 million.