North Korean leader Kim Jong-un has sent a telegram to Russian President Vladimir Putin in celebration of Russia Day, a national holiday to mark the country's declaration of sovereignty.

According to Russia's state-run TASS news agency on Tuesday, Kim, in his congratulatory message, said "the Russian people have achieved success in building a powerful Russia under Putin's leadership, braving all challenges and difficulties."

Anticipating success for Putin in building a powerful Russia, the North Korean leader also wished the strategic and traditional relations between his country and Russia would become stronger.

On June 12th, 1990, Soviet leaders signed a declaration of Russia's state sovereignty, which marked the start of democratic reforms in Russia.