North Korean leader Kim Jong Un, left, supervises the test-firing of two types of new anti-air missiles at an undisclosed location in North Korea. Korean Central News Agency/Korea News Service via AP

North Korean leader Kim Jong Un supervised the test-firing of two types of new antiair missiles, state media said Sunday, displaying his expanding military capabilities as the South Korean and U.S. militaries carry out joint drills.

The North's official Korean Central News Agency said the test Saturday proved the missiles effective in countering aerial threats such as drones and cruise missiles, and that Kim assigned unspecified "important" tasks to defense scientists ahead of a major political conference expected early next year.

The report did not specify the missiles that were tested or where the event took place. It did not mention any remarks by Kim directed at Washington or Seoul.

The test coincided with new South Korean President Lee Jae Myung 's trip to Tokyo for a summit with Japanese Prime Minister Shigeru Ishiba, where they vowed to strengthen bilateral cooperation and their trilateral partnership with the United States to address common challenges, including North Korea's nuclear ambitions. Lee was to depart for Washington on Sunday for a summit with President Trump.

Kim's government has repeatedly dismissed calls by Seoul and Washington to restart long-stalled negotiations aimed at winding down his nuclear weapons and missiles programs, as he continues to prioritize Russia as part of a foreign policy aimed at expanding ties with nations confronting the United States.

Since Russia's invasion of Ukraine, Kim has sent thousands of troops and large shipments of weapons, including artillery and ballistic missiles, to help fuel President Vladimir Putin's warfighting.

That has raised concerns Moscow could provide technology that strengthens Kim's nuclear-armed military, with experts pointing to North Korea's aging antiair and radar systems as a likely area of cooperation.

South Korea's previous conservative government said in November that Russia supplied missiles and other equipment to help strengthen air defenses of the North Korean capital of Pyongyang, but did not specify which systems were provided.

Kim held a ceremony in Pyongyang last week to honor North Korean soldiers who fought in Ukraine, awarding state "hero" titles to those who returned and placing medals beside 101 portraits of the fallen, praising them as "great men, great heroes and great patriots," state media reported.

According to South Korean assessments, North Korea has sent around 15,000 troops to Russia since last fall and about 600 of them have died in combat. Kim has also agreed to send thousands of military construction workers and deminers to Russia's Kursk region, a deployment South Korean intelligence believes could happen soon.

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