Japanese blues - The Dokdo Insignia

Whilst I am seemingly immersed in a nautical theme, how about just one more?

Check out the service patch of the Korean Navy's light aircraft craft carrier helicopter support ship Dokdo (Takeshima?)


What is the significance of the Japanese archipelago being in a different color scheme than all the other landmasses?...and how about that South Korean flag emblazoned across North China, what's up with that?

Hmmmmmmm?