Those particular Russians that would be fed with Chinese ration packs are currently in Ukraine, shooting at Ukrainians and getting shot at in return. They're unlikely to starve, but they might desert if the army can't feed them anymore.

This war would not be possible without popular support from Russians. Like Germans in WWII they are responsible for this war happening.

Russian military is currently systematically destroying farming equipment in Ukraine that can lead to starvation in Ukraine. Russian army is not letting to create humanitarian corridors by mining them and by shooting and shelling already agreed corridors.