Ok, and now what if the two parties are anonymous or one lives in Russia?

In that case the judge can't do shit.

If you want the protections of courts, there is already a perfectly easy way to do that. And that is to use a real contract.

But if you explicitly do NOT want that, and explicitly DO want code to be law, that is what ethereum is for.

a judge can't take away the crytocurrencies of some anonymous other party.