The European Union Disbands.
America has a bond crisis and is calling home troops from all over the world
England is well, they got their own problems
Russia won't care
So none of these nations interfere

European nations all over have strong right wing parties and they need your help, taking white only recruits from America, Canada, etc
Resistance movements and civil wars and immigrant repatriations are everywhere
Sweden
Norway
Ireland
Germany
France
Greece
Spain
Netherlands
Denmark
there are other countries, but these have the biggest problems

My top picks:
Germany and Ireland, then Sweden

reminder: I am not talking about taking territory from other white countries, even though Germany and Ireland have historic territory disputes