Laughing and joking, Russian President Vladimir Putin and North Korean leader Kim Jong Un cruised around Pyongyang last week in a Russian-made Aurus limousine to showcase their strengthened anti-Western alliance.

The luxury sedan was intended to epitomize Russia's domestic prowess and reduced dependence on imported technology and goods when unveiled in 2018.

But customs records show that the company that builds it uses millions of dollars in imported parts, many arriving in Russia from what Kim has described as his country's "primary foe," South Korea.