North Korea test-fired a new ballistic missile carrying a super-large warhead and an improved strategic cruise missile, state media reported Thursday, as leader Kim Jong Un called for increased weapons development.

North Korea tested new tactical ballistic missiles using super-large warheads and modified cruise missiles on Wednesday led by leader Kim Jong Un, who called for stronger conventional weapons and nuclear capabilities,

North Korea fired a suspected ballistic missile in what would be it second such barrage this month, as Kim Jong Un’s regime intensifies a threat to expand its nuclear weapons program.

A senior Russian official visited Iran on Tuesday, likely to bolster missile supplies, experts said. His visit came days after a trip to North Korea.

Russian Security Council Secretary Sergei Shoigu arrived in Iran on an unannounced visit just days after he held talks in Pyongyang with North Korean leader Kim Jong Un.