RU is Russia union?
So troops first or nuke first?
Enlighten me.
I an not an expert but IMO
RU mean Russia
Troop are troop meant for deployment or backup or whatever wherever needed.
Nuke is use for if territory of Russia is being attack.
Russia now want to declare the 4 regions as Russia territories(regardless how illegal that is)
So with that 4 region recognised as Russia territories, Russia now threaten( or US call it bluffing) if the 4 region is being attack,
Russia will retaliate with nukes into Ukraine or whoever that attack.
So it is a game of dare played by the big boys, the next few week see who is bluffing and who is smoking weeds.
Ukraine who has nothing to do would probably continue to bomb the 4 regions. We see in a few weeks or months whether Russia is tuapaoxian or not. Hope that help, and I might be wrong though.
And if Russia really nuke Ukraine, the balls now goes back to NATO/US for next course of action