Citizens of countries with which Ukraine has a visa-free regime can stay in Ukraine for up to 90 days within 180 days without obtaining a visa. There is no need to receive an invitation in this case, however, recently, when crossing the border, border guards ask to confirm the purpose of the trip, which can be done by presenting an invitation. Therefore, issuing invitations, for example, to Armenians or Belarusians, although not mandatory, is desirable.