It sounds very reasonable when you say it, but he is one of the primary politicians that organized this:
https://www.stopwar.org.uk/article/...e-war-statement-on-the-crisis-over-ukraine-2/
In this case, arguing that we should not support Ukraine with weapons is equivalent to arguing that Russia should take a piece of Ukraine that it deems desirable.
The positions are functionally equivalent and are different only in intent. Russia wants the West to stop arming Ukraine because it wants to destroy the Ukrainian nation. Pacifists want the West to stop arming Ukraine because they are against any violence.
I have always been uncomfortable with philosophical positions that lead to same outcomes for different reasons, with only intent separating say, Putin and say, myself.
It suggests that good and evil are only differentiated by thought, and that always seemed to be a fallacy to me.