First of all, it is definitely not possible here in the Far East. As soon as the Siberian cold current goes south, it freezes directly into a dog, which is not a place where people live at all. To build a factory here, you have to think about whether there are workers. Moreover, it is only a colony, and I have never heard of any important facilities in the colony.
Secondly, the Baltic Sea is also an inland sea and a mess at high latitudes. Going out to the east is the Arctic Ocean, and to the west is the North Sea. There are a lot of NATO countries along the North Sea coast, and one Britain can block you home. And it is particularly easy to block. Planes can take off directly from the shore, and even aircraft carriers can rub you on the ground. During World War II, Britain didn't even bother to build an aircraft carrier because it didn't need an aircraft carrier to block Germany.
Finally, return to Ukraine. Ukraine is the home of Russia, equivalent to Henan in China. As for why it magically split later, there is no need to ask why Russia built Ukraine.
Then, Turkey is a complete piece of shit in front of the Soviet Union. Greece, Syria and Armenia around Turkey are all waiting to laugh and watch Russia feed Turkey with shit.
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In fact, to put it bluntly, Russia is a landlocked country with the same nature as Germany, and there is no need to build a large navy at all, so you should not entangle these issues.
This is different from China. China not only unified the headquarters of China, but also occupied all the strategic places in history, and there were no enemies on land. Take India as an example. If he wants to go to war with China, he must climb a mountain first. Now there is only one Mongolia left on the land that will be pocketed sooner or later, and China has had enough.
Russia is different. The Soviet Union successfully unified the Eastern Slavs, controlled the Yugoslavs and fought against the Western Slavs. As a result, after the disintegration of the Soviet Union, even the Eastern Slavs are now split. For example, this is similar to the fact that China is not only divided into southerners and northerners, but also divided into coastal people and inland people in South Renye Fang. In this case, your strategic defense line will be completely broken. How can there be a once and for all solution?