SEOUL -- North Korea says it has successfully test-fired a newly developed ballistic missile from a submarine in what would be the latest display of the country's advancing military capability.

The official Korean Central News Agency said Saturday that North Korean leader Kim Jong Un personally attended the test launching of what he described as a "world-level strategic weapon." The report did not reveal the exact timing and location of the launch.

There has been expectations that Kim would attend the Victory Day celebration in Russia for his international debut, but North Korea has sent to Moscow the head of its rubber-stamp parliament instead.