Until 1814 there was a single "Moldova", stretching from the Carpathians in the West to the Dniester in the East and from what is now SW Ukraine to the northen shores of the Black Sea. Ecclesiastically the whole province was subordinate to the Metropolitan See of Iasi.
But in 1814, the eastern half of the principality, between Prut and Dniester, aka Basarabia, was occupied by Russia, becoming a Russian "gubernia" until 1918. Between 1918-1942, it was part of Romania.The ecclesiastical unity was destroyed too, the Russian Moldova becoming an eparchy of the Russian Church. Today there are two Metropolias there: the largest one,"The Metropolia of Kishinev and of the entire Moldavia", headed by Metropolitan Vladimir of Chishinau (Kishinev), a Romanian ethnic, depending on the Moscow Patriarchate; the smaller one, "The Metropolia of Basarabia", headed by Metropolitan Petru of Balti, depending on the Romanian Patriarchate. This is a point of contention between the Russian an Romanian Churches. Both sides with their arguments.
In addition to these, there is another "Metropolia of Moldova and Bucovina", having jurisdiction over the Western part of the historical Moldova. This is part of the Romanian Church.