How sustainable are foreign recruits in a war of attrition?
One proposal in Ukraine for military reforms was to staff close to 50% of infantry or assault units with foreign recruits. I assume the Russians are also looking into expanding the use of foreigners. Given given the level of attrition in a large-scale conventional war, is that even a viable plan? In previous wars where the belligerents turned to foreign manpower, what was their experience in dealing with attrition among their ranks?