Beijing and Moscow have called for sanctions to be eased on the North to jumpstart diplomatic talks and improve the humanitarian situation.
When asked by reporters if Russia would help Kim build satellites, Putin replied: "That's why we came here."
The North Korean leader has now arrived in Russia for his meeting with Putin.
Russia's President Vladimir Putin and North Korea's leader Kim Jong Un may talk about Moscow sending humanitarian aid to Pyongyang.
The United States has said it would be a "huge mistake" for North Korea to supply Russia with weapons to use in Ukraine and warned Pyongyang would "pay a price".
Submarine No. 841 - named Hero Kim Kun Ok after a North Korean historical figure - will be one of the main "underwater offensive means of the naval force" of North Korea, leader Kim Jong Un said.
In response to recent allegations from a UN Panel of Experts that entities in Russia were procuring items for North Korea's missile program, Russia denied any knowledge or information on transactions
"I am firmly convinced that the friendship and solidarity ... will be further developed into a long-standing strategic relationship in conformity with the demand of the new era," Kim wrote.
The monitors, who report to the council twice a year, have previously accused North Korea of using cyberattacks to help fund its nuclear and missile programs.
Russian defense minister Sergei Shoigu was joined by Chinese Communist Party Politburo member Li Hongzhong at the 70th anniversary of North Korea's founding.
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