Armenia allows citizens of specific countries and territories to visit Armenia for tourism or business purposes without having to obtain a visa or allows them to obtain a visa on arrival or online. For some countries the visa requirement waiver is practiced on ad hoc basis and is not formalized by a bilateral agreement. Citizens of the Commonwealth of Independent States and citizens of all Eurasian Economic Union and European Union member states may enter Armenia without a visa.
Please get more details from the link here: https://visaguide.world/asia/armenia-visa/