ccTLDs are special as they are entirely delegated to the countries that they're assigned to. WIPO offers UDRP servicing for ccTLDs, but they need to opt-in to it [1].
Notably .ar (and .su as the other responder to your comment notes) is not part of that. Therefore the process is going to depend upon the specific country/agency overseeing the ccTLD.
Notably .ar (and .su as the other responder to your comment notes) is not part of that. Therefore the process is going to depend upon the specific country/agency overseeing the ccTLD.
[1]: https://www.wipo.int/amc/en/domains/cctld/