How to block Russian and Indian country players?

You cant because they are evrywhere. The russians want to declare petroff defence as the only way and indians wants to sell the ultimate trick of KIA of conquering e5

just cancel game if you don't like opponent.
But maybe it is unfair to take it out on people who have little control over their country and are not really that different than you.
Eg someone might be mad at USA because USA/Nato played in Libya (while ignoring similar arab spring protests get stomped out violently by US allies) which used to have some of best womens rights in middle east and low debt and willingly gave up WMD and is now an endless proxy war mess. So they may want to ban all US players. But would that be fair?

This is the fallacy of composition. Just because something is true of the whole, does not mean that it is true of the parts. Please rethink your judgements before posting.