Trump is missing a trick. It would be simpler to fund it to push Russia out, see Putin fail and be deposed, and the country dissolve into 24 separate states. Then he could do business with Ukraine AND probably own large swathes of Russia. And there would be no 'second' war within two years.
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Rightly or wrongly, he sees Russia as a rival mob largely interested in territories that he isn't, and vice-versa.
He helps Putin own Ukraine and the odd former Soviet state, and expects Putin to do likewise for him & Greenland etc...