Why would Transnistria even bother seceding from Moldova?

As the little East European country of Moldova goes to the polls in a general election in which the pro-Europe incumbent party is hoping to consolidate power and make membership of the EU a reality, it is fighting against Russian electoral meddling and disinformation. Like Russia doesn't have anything better to do right now...

One of the hot issues in Moldova is the would-be breakaway region of Transnistria, a tiny isolated sliver of land on the Moldovan border with Ukraine. It has remained defiantly pro-Russian, even as Moldova, like most of the rest of the region, looks westward toward Europe as a way of extricating itself from Russian dominance. It usually hosts some 1,500 Russian troops, and remains a persistent thorn in Moldova's side.

Transnistria wants to be independent of Moldova. It even went to war over it briefly in 1992, after the dissolution of the Soviet Union. It has its own constitution, flag, national anthem, and coat of arms. But pretty much nobody considers it an independent state (apart possibly from Russia), and it is internationally recognized as just another part of Moldova. Moldova has warned, though, that if Russia defeats and annexes Ukraine, little Transnistria is likely to be the next Ukraine, which would give it a platform to invade Moldova.

The thing that gets me, though, is that Transnistria is TINY. It has a population of about 400,000 and an area of around 4,000 square kilometres. That makes it significantly smaller than the city of Toronto and MUCH less populated. It would be the equivalent of, say, the city of Saskatoon wanting to secede from Canada.

It's not even THAT Russian. Ethnically, it's population is split about evenly between Russians, Ukrainians and Moldovan/Romanians, although almost half have duel Russian citizenship. 

So, why would it be so vociferous about wanting to split from Moldova? Does it really want to declare its vassalage to Russia, after all that went down during its time in the USSR? Maybe Moldova is not the best state to belong to, but it can't possibly be worse than being an entirely insignificant part of the Russian Empire. The whole thing seems bizarre to me.