That's often said but it doesn't make sense to me. By the war being drawn out, it's meant Russia has now had time to go to other evil states to negotiate and as a result, Iran and North Korea will be getting who knows what tech from Russia in return for the ammo Russia needs from them. Iran and North Korea potentially getting advanced fighters, Russian missile tech, maybe even help with nuclear weapons, far outweighs any benefit anyone would put logically put on Russia being tied up.
Flip side is that it keeps Russia from competing in markets the US have an interest in and with potential tensions between China and the US if it comes to it a weakened Russia is less able to aid China against the US. Countries are also more likely to turn to the US for military procurement rather than Russia.
EDIT: Iran and NK have been getting help with those things anyhow - a lot of North Korea missile development is actually aided by Iran who ironically acquired a lot of information as to Russian missile tech from and/or via Ukraine. China is almost certainly aiding NK to a certain extent - some of their nuclear weapons advances are almost certainly from China, China has also been one of the sources for the TEL vehicles for their missiles and some mobile artillery, etc.
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