North Korea's long-range missile launches are usually concentrated in April.
Out of five long-range missile launches so far, the firing of the Unha-2 rocket in 2009, and the launch of the Unha-3 rocket in 2012, both took place in April.
With the South Korea-U.S. joint military drills ending this week, and major political events in store in North Korea, another provocation could be in the works.
This week, in fact, is critical.
North Korea will celebrate the Day of the Sun, the birth anniversary of late leader and founder Kim Il-sung, on Tuesday, and the annual Key Resolve and Foal Eagle exercises come to an end on Friday.
Moreover, North Korea has unofficially informed Japan of plans to launch additional missiles by Thursday, April 17.
Pyongyang has also continuously slammed the South Korea-U.S. joint military drills.
"If enemy forces violate our airspace, we will burn their bases to the ground."
However, some experts say Pyongyang could return to the negotiating table, if there isn't a much anticipated missile launch.
"There's a chance North Korea could give up its nuclear tests, if the 6-party talks on denuclearizing the North resume. Pyongyang could make a gesture to improve inter-Korean ties first."
Neighboring countries, such as South Korea and China, as well as the U.S., are keeping a close eye on the nation's movements.
They are not ruling out the possibility of the North either engaging in further provocations or coming back to the negotiating table.
Kim Min-ji, Arirang News.