Yes, it can be registered but requires a Serbian person to do as all registrations require an "ID Number". If you're from Serbia and you have $100 on you (only $30 if you're registering locally as far as I can tell) then register the domain and let the owner have it back because otherwise it will get jacked by some SEO scumbag and turned into a content farm, guaranteed.
CRI Domains itself says it can't be registered, but every other registrar I checked will let you proceed to checkout.
"If the domain has not been renewed prior to the expiry date, the domain’s status will change to Expired. The domain name can be renewed in the next thirty days. If the domain name is not renewed within that period, the domain will be purged from the registry database and will become free for registration."
CRI Domains itself says it can't be registered, but every other registrar I checked will let you proceed to checkout.