Sun Moon, Dyad Moon, are names for the Full Moon that falls in Gemini. (Incidentally, the "moon falling in Gemini" is a different matter from the Moon being "in Gemini" in an astrological chart. When I talk about the Full Moon that falls in Gemini, I mean the Full Moon that falls sometime from May 21 to June 21.) The Dyad Moon will be full on Thursday, May 27.
It's a time when opposites attract; magically good for working on relationships. It's a time when differences can turn from a liability to an asset.
I think this applies more to personal differences than political ones. The Moon is not very political.
But we can hope for the energies of the night to lend themselves to some less than deadly resolution to the differences on the Korean Peninsula.
