"those ones" is definitely not needed here. "those" is sufficient. I can't think of an occasion when you would need "those ones". If "those" clearly refers to a specific antecedent, then adding "ones" makes no difference. If using "those" is not clear enough, then neither will "those ones".

The issue of "those ones" is debated by native speakers. The expression is commonly said also in the UK but many people think that doing so is poor style. I don't think this is a UK/US English issue. In terms of meaning, "ones" is redundant when used with "these" and "those". In informal conversation, "those ones" sounds natural but I would recommend avoiding its use in formal writing. Your sentence was also so short that "those ones" seemed excessive.

I agree with Michael. "those ones" are not usually used with people but objects/ things (unless you are trying to be rude and are associating the people with objects). "Your country is extend" doesn't make sense. Are you trying to say the country is LARGE? EXPANSIVE?

I disagree with Michael; maybe it's a difference between UK English and American English. I say "those ones" all the time. I do think it's strange to say "those ones" when talking about people, though. Saying "this one," "that one," "those ones" etc. usually refers to objects, not people. "Your country is so extend" does not make sense. Do you mean "extensive"? That would be correct grammar, but the meaning is still unclear. What are you trying to say?