North Korea’s oil tankers have returned to more regular routes in recent weeks after a surge of activity in October, coinciding with the 70th anniversary of the founding of the Workers’ Party of Korea.

The majority of the DPRK’s oil tankers once again appear to be visiting or heading from terminals in the Russian Far East, primarily Vladivostok.

Five North Korean tankers left the Russian terminal in the last two weeks, all on the same heading, according to the NK News ship tracker.

In that journey the group likely delivered approximately 10,000 tons of oil products to North Korea,