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A train carrying North Korean leader Kim Jong Un has entered Russia, Russian state news agency Ria Novosti said Tuesday.
The train crossed into the Primorsky region from North Korea with images showing a train with dark green carriages being pulled along a track by a Russian Railways locomotive.
South Korea's defence ministry said earlier it believed Kim's train had entered Russia Tuesday, reports AFP.
Kim will meet Putin later this week.
The visit is Kim's first trip abroad in four years.
Experts say Moscow would likely seek artillery shells and antitank missiles from North Korea, which wants advanced satellite and nuclear-powered submarine technology in return.
Putin is currently in Vladivostok for an annual economic forum.
Kremlin spokesman Dmitry Peskov told Russian media the two leaders would discuss "sensitive" subjects.
The leaders would ignore US "warnings" over the talks, Peskov told reporters.
Washington has said North Korea would "pay a price" if it supplies Moscow with weapons for the Ukraine conflict.
Bd-pratidin English/Golam Rosul
