If that was the goal, why is Trump asking for Ukraine's natural resources? Maybe his goals are different than yours.
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Russia annexed Crimea in 2014, which is why Ukraine was seeking protection.
From Ukraine's point of view, if they make peace now, and give up territory... Russia will do the same thing again in a couple of years. Many more people will die.
Russia doesn't care about killing off its population, they have lots of poor and non-ethnic-Russian citizens, and they think nothing of having them die to get some more land.