u/Bombermaster

Let's say that suddenly aliens arrive on earth: without as much of an introduction, they take control over an uninhabited portion of the extreme north of Russia, escort out any humans and animals that might have been there, and create basically overnight a base/city with unknown advanced technologies.
Outside of that while they're not hiding, they don't seem particularly interested in getting outside their base, allow anyone to get inside their base, or interested in any contact past telling people trying to get inside to leave.

How you think nations would try to handle this situation, and which ones would try to attack it despite no aggressive actions taken from them except grabbing that empty territory?

Repost because it's been a while since it was last posted and it's a fun one to play whenever done by choice or randomly, if only for all the possible interactions among the major arcanas.

Link to imagechest https://imgchest.com/p/n87wvp2x4xd

I've been considering a scenario of an isekai where the protagonist has no knowledge of the isekai genre, the world it is in, or even know if he got any powers/deals out of it.

So let's put this theoretical: You're sent in an isekai with a power set of your choosing without you knowing that you'd lose your memories in the process. Your memories of isekais, of your powers selected and standard tropes are completely gone off your mind.
Which powerset you think you would had chosen without knowing any better (don't say omnipotence/reality warping/etc that makes for a boring choice) , and how long you think you'd find out your powers if at all? Do you think you would survive before finding out your abilities?