Citizens of Canada, CIS countries, the EU, Japan, Norway, Switzerland, and the United States do not need a visa to visit Moldova and may remain for up to 90 days in a six-month period without registering. Citizens of other countries must acquire a visa from the closest Moldovan embassy, or they may receive a visa on arrival at Chişinău airport and at certain land border crossings if an officially approved invitation letter from Moldova is obtained ahead of time.
If you are a motivated individual traveling into Moldova through Ukraine, be aware that you may be entering Transnistria. Some buses from Odessa pass via Tiraspol, but others bypass the city, trading two border crossings for extra time on the route. Transnistria is an unrecognized state in Moldova’s east, bordering Ukraine, that split away from the nation after a conflict in 1992. Westerners usually have minimal difficulties crossing Transnistrian borders by bus, but international travelers have had difficulty in the past. There is a slight possibility that international visitors may be requested to pay bribes, but buses that travel between Ukraine, Transnistria, and the rest of Moldova generally manage border talks effectively, collecting passports and negotiating with Transnistrian officials. Also, since Moldova does not recognize Transnistria as a state, there is no Moldovan border check between Transnistria and the rest of Moldova, thus you may have to explain yourself if you attempt to leave Moldova without an entry stamp.