I don't understand why anyone, left or right, would support Russia in this war, morally speaking.

Of course, reasonable people can differ on whether we should support Ukraine with arms and ammunition.'

I admit I was confused by your question, because the "nationalist" label is usually applied to pro-Trumpers, and the TDS label is usually applied to never-Trumpers and Dems who can't control their outrage at Trump. So, I wasn't sure who you were going after.