SEOUL, South Korea — North Korea’s Kim Jong Un vowed “full and unconditional support” for Russia’s Vladimir Putin on Wednesday as the two leaders isolated by the West held a summit that the U.S. warned could lead to a deal to supply ammunition for Moscow’s war in Ukraine.

       The meeting, which lasted over four hours at Russia’s spaceport in the Far East, underscores how the two countries’ interests are aligning: Putin is believed to be seeking one of the few things impoverished North Korea has in abundance -– stockpiles of aging ammunition and rockets for Soviet-era weapons.

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       Such a request would mark a role reversal from the 1950-53 Korean War, when Moscow gave weapons to support Pyongyang’s invasion of South Korea, and in the decades of Soviet sponsorship of the North that followed.