Russian President Vladimir Putin sent a letter to North Korean leader Kim Jong-un on Monday, promising to expand cooperation between the two countries despite being increasingly ostracized on the world stage. "It said that we would continue to expand the comprehensive and constructive bilateral relations with common efforts, adding that this would entirely conform with the interests of the peoples of the two countries and contribute to strengthening the security and stability of the Korean peninsula and the whole of the Northeastern Asian region," North Korean state media outlet KCNA wrote. Putin sent the letter to commemorate the day of liberation, a national holiday that marks Korea's liberation from Japan 77 years ago. North Korea joined Russia and three other countries in voting against a United Nations resolution in March condemning Putin's invasion of Ukraine. BROMANCE?