Lesser of two evils applies when there is a dichotomy of two likely outcomes both of which you see as evil.

In this case, the United States can simply not invade. Then there will be no problem.

The problem is that Jen Psaki is going on television and telling the country a bold-faced lie. It is just a lie, that is all there is to it. Russia is not the aggressor. The United State is the aggressor.

No US invasion, no evil.