Are There Currently Countries To Avoid Buying Ancient Coins From?

Buying ancient coins can be tricky.
In all the countries there are good and bad sellers.
About Cyprus, because I am a Cypriot ebay seller, there are some good and trusted sellers on ebay and some to avoid or they are risky.
Scroll and read the feedback of the sellers is a good start, also compare sizes and weight with online samples, ask help from the forum if you are not sure etc.
Auctions can also be risky, especially if the images are not clear.
My advice is don't rush to buy unless you are sure of what you are buying.

There are two interrelated points to consider. The first is that there are very few countries from which genuine ancient coins can be legally exported without specific government permission. The second is that there are certain locations that are notorious for producing and distributing fakes.

The most notorious, of course, is Bulgaria. Not only is this country a prolific producer of fake ancient coins but trafficking in genuine ancient coins in Bulgaria is a very serious crime.

It will behoove you to familiarize yourself with the laws of various source countries. Few are as enlightened as the UK in this regard. Also be aware that the importer may bear legal responsibility for coins that were illegally exported.

As far as fakes go, caution is advised generally on ebay. Greece, Southeastern Europe, Cyprus, China and Thailand should be avoided altogether in my opinion. I have also noticed bad actors registered in the UK, Spain, Russia and Morocco of late. There are a number of sellers in India offering genuine coins but their export is illegal.

There is no free lunch. If a deal is too good to be true, it probably is. It is not unusual for someone to post on this forum a $1000 coin that they just won on ebay for $50, and now they are concerned that it might be fake. Seriously?

Not that there aren't deals to be had on ebay. There are. Until you are knowledgeable and confident, however, at least be smart. Check the fakeseller lists and fake coin reporting sites. Look at a seller's previously sold items. If you see a lineup that would be the envy of one of the great auction houses and everything sells for $40 or $50, something is wrong.

Caveat emptor.

Kushanshah Well stated.
In all, I try to just deal domestically. Not to say that there aren't any bad actors here as well.