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There's a name given to a limited-duration effect seen in the US where, under certain conditions, US Presidents get a short-term spike in popularity during military conflicts. That's not a very long-lasting effect, but it is quite dramatic in strength -- if the public considers the country to be at risk, they will tend to put aside political differences and support the current leadership.

https://en.wikipedia.org/wiki/Rally_'round_the_flag_effect

The rally 'round the flag effect (or syndrome) is a concept used in political science and international relations to explain increased short-run popular support of a country's government or political leaders during periods of international crisis or war.[1] Because the effect can reduce criticism of governmental policies, it can be seen as a factor of diversionary foreign policy.[1]

But suppose that instead of a short-term effect because of a temporary conflict, you can have a country -- from a domestic political standpoint, at any rate, no or little actual fighting required -- staying in a permanent, wartime crisis mode. Then maybe you can leverage the effect on an ongoing basis. North Korea has, rarely, had limited and small conflicts with South Korea subsequent to the Korean War. If it did initiate a second annexation attempt, it would likely go poorly for North Korea. It is not likely, as things stand, to initiate a second attempt. But by keeping the country politically at a state of war...well, you can still maintain control when, by most respects, North Korea's situation isn't all that great for the typical person in North Korea. The Kim dynasty is quite politically-repressive, and the country has about three percent the per-capita GDP of South Korea. That's ordinarily a situation where people are likely going to ask some difficult questions of the government. But as long as, from a political standpoint, the country is at war...shrugs

Russia in 2023 is more-politically-repressive than it was, say, ten years back, but it's also still no North Korea. But I have wondered whether it might be the case that the Kremlin winds up trying to leverage some of the same mechanisms that the Kim dynasty does.