This is an immigration question. Pass to that area. I think you have to formally renounce your Russian citizenship. Infront of whom, I'm not sure.

This is too complex to answer in a forum like this. Hire an international tax attorney or accountant and he can advise you and perhaps prepare the...

You need a lawyer -solicitor- in the UK. Hire one. An American lawyer who deals with England may be able to assist you.

This is a UK question. Asl an English solicitor.

If the assets are in Russia, the solution will be there. You need to hire an attorney in Russia -or a firm that deals a lot with Russia- to solve...

Yes, generally you can proceed. Worst case, you may have to sever the case unless the UK defendant is a necessary party. I assume you have a lawyer.

The long and short of it is yes. Hire a Mexican divorce lawyer and get started. Jurisdiction for divorce lies where the couple resides, not where...

It depends on UK law. Contact the British embassy or consulate and ask.

This is a Russian question. If the assets are frozen there, it is more than likely because of Russian regulations. You need to hire an...

This is too complex a question for this forum. From your description it seems an offshore company would be the best solution. Hire an international...