Amid growing indicators about the possibility of new submarine-launched ballistic capabilities being completed and a record of using its April 15 Day of the Sun anniversary to test missile technology, analysts were uncertain Tuesday whether conditions are currently right for North Korea to use its forthcoming anniversary for military-related events.

Since Kim Jong Un came to power, North Korea has tested missile-related technology in the days immediately before and after the April 15 anniversary on five separate occasions. Thursday will mark the 10th Day of the Sun holiday since Kim came to power and the 109th birthday of the late founding president Kim Il Sung.