That's nonsense, but even if we take as true for a moment;
The argument here is they don't want to buy our weapons because we might decide to stop selling to them. Do you really see that as even vaguely likely in a war against Russia?
We want to make our own weapons because depending on someone else can be more costly.
But some parties in UK do have worrying ties to Russia (reform uk and conservatives). I mean who would have thought that Republicans in US would be 3rd best allies of Putin, right after China and North Korea
The argument here is they don't want to buy our weapons because we might decide to stop selling to them. Do you really see that as even vaguely likely in a war against Russia?