Yes: Notice that without the Baltic Sea, which is effectively closed, and the Crimean region of Ukraine, Russia is not a European naval power, and experts have long argued (afaik) not much of a European power.

Similarly, notice how much they invested in their naval base in Syria on the Mediterranean (though I'm not sure of its status now, and they oddly seemed to abandon Assad, who provided it to them).

More critically, think of a war: How do they trade by sea by sea? Their economy could be choked off, restricted to Pacific trade and trains across Asia to the population centers. They are in a corner.