This is how I imagine it would work:

Germaaine's ruler decides that the whole galaxy shoud speak Germaa. He sends an invasion force to the planet Polis.

Britonah declares interplanetary war on Germaiine.

Germaaine then invades Hothand and Belgin. Francia immediately surrenders.

Germaaine's plans to invade Britonah are delayed when they lose the fighter battle in the exosphere. So instead they decide to blast the f*ck out of all major cities on the planet.

While the inhabitants of Merikaan are all watching what's going on in that part of the galaxy, a force from Japin 4 launches a surprise raid and destroys most of their war fleet.

Italo sides with Germaaine and shows off its droid army. The army is later rendered ineffective when Britonah discovers the 'off' switch.

The inhabitants of Switzzzk watch everything with disdainful uninterest, but aren't too proud to launder Germaaine's stolen credits.

Merikaan eventually decides to help Britonah and together they liberate the galaxy.

Merikaan then invents a space station with enough firepower to destroy an entire planet, and uses it on Japin 4 (twice).