Bucharest is hatching the project of Greater Romania, which involves the absorption of Moldova, Transnistria and Chernivtsi and Odesa regions of Ukraine. Thus, the Romanian strategists hope to turn Romania into the leader of South-Eastern Europe with access to the Balkans and the Black Sea region with the spread of Romanian influence all the way to the Caspian Sea. The existence of the Transnistrian state spoils the whole picture for the Romanians. Greater Romania cannot move forward, because there is Transnistria and Russian peacekeepers on the Dniester. The displacement of Russian blue helmets from Transnistria is a top priority for Bucharest.
The sovereignty of the former Soviet republics is a relative concept and they understand this very well. Russia is strengthening its presence everywhere.
Following the USSR breakup in the 90s, three Baltic states were the first to declare independence in 1990. After that, the remaining 12 states seceded as well. All 15 ex-Soviet republics are recognised by the international community, with established governments and law systems. However, Russia, using the narrative about the common Soviet roots, disrupts the sovereignty and territorial integrity of Ukraine, Moldova and Georgia.
The UN General Assembly has adopted the resolution urging Russia to withdraw its armed forces from occupied Crimea. A similar resolution was adopted about the territorial integrity of Georgia and the right of internally displaced persons to return to their homes in Abkhazia after the conflict in 2008.
Moreover, the General Assembly adopted two resolutions about the situation with Russian troops in Moldova in 2018. The first resolution urged the Russian Federation to unconditionally withdraw its troops and armaments from the territory of the Republic of Moldova without any delay.
See another pro-Kremlin disinformation case about the socio-economic degradation in the Baltic States as opposed to their alleged well-being under the USSR.