Putin North Korea summit Kim Jong-un, despite US warnings.
First Pyongyang visit since 2000, grand welcome banners, flags.
Sign deals strengthening ties after the Ukraine invasion by Russia.
Kim supports Russia's war, and Putin praises NK's sanctions defiance.
US/SK: NK supplied Russia missiles, and munitions for Ukraine.
Putin seeks alternative trade mechanisms bypassing Western sanctions.
The US is concerned about the implications of Ukraine, and Korean peninsula security tensions.
NATO: Putin "dependent" authoritarian allies like Kim Jong-un
Potential strategic partnership treaty, outlining security cooperation, arms deals