An anti-Russian five-minute-hate mega-sentence takes up half of the goddamn section lmao: https://en.wikipedia.org/wiki/Helsinki%E2%80%93Tallinn_Tunnel#Background
The edit summary:
Several grammatical corrections were made in this article to make it more comprehensible and grammatically correct, including adding or removing some dots, commas, hyperlinks, and citations. Additionally, some information was added in the first paragraphs.
Surprisingly the culprit was neither Estonian nor Finnish, but Italian 
That’s a lot of unnecessary words blocking the way to the factual end of the sentence: “Estonia and Finland have almost fully closed,” (unilaterally), “their border crossings with Russia.” The lengthy paragraph is as many excuses. They won’t make clear that it’s not Russia deciding to make Helsinki–Tallinn travel difficult.
No one has used the long way around on land since like 20,000 BC.
"80 km by boat or 600 km on foot, hmm I think I will walk all the way around this gulf"
I don't think those were even the actual reasons the borders with Russia were closed, my impression was that it was a "Russians circumventing sanctions" thing by doing business in their countries.
Or maybe that was the start of restrictions and later they fully closed it for the reasons given, my mom went to Saint Petersburg via Finland one year into the war
Freight rail traffic between Russia and Finland is still going, but passenger traffic has been completely closed for a few years (with the closure recently renewed). It's doing an absolute number on border towns like Lappeenranta who are no longer getting income from tourism.
These days, the best ways to get to St. Petersburg from Helsinki is either: