North Korea tested “two kinds of submarine-launched strategic cruise missiles” (SLCMs) from a submarine in the East Sea (Sea of Japan) on Wednesday, according to state media.

The test followed the opening of a large weapons museum and ballistic missile tests earlier this week. It is part of a consistent stream of missile testing this year, with at least one reportedly taking place every month except February.

The Korean Central News Agency (KCNA) reportedon Thursday that the latest test “aimed to examine the current mobilized posture of the underwater combat systems.” This appeared to serve as a