It emphasises the negative effect Putin has on the country. And he does. He's plunging the country and the world into an unnecessary war just to feed his pride, and he does so in a clear break from his predecessor. Putin's Russia is significantly different from Yeltsin's Russia that it's worth pointing out the difference, especially since that difference is all him.

And while you could certainly argue that for example Bush plunged his country into an unnecessary war to feed his pride, you're arguing that he's not that much of a break from his predecessors. And the American people as a whole definitely carry more of that responsibility. That's still a reason to call out Putin specifically, instead of the country as a whole.