Biden is caught between 3 competing ideas: fighting inflation, cutting off Russian oil, and fighting climate change.

Cutting off Russian oil would would require a collective effort by all the Western democracies, not just the US. But if they managed to do that, the price of oil would probably go over $150 a barrel, and that would cause massive inflation and recession, and damage public support for helping Ukraine.

Presidents are often faced with a situation where they have to thread that needle. It's what made Lincoln such a great President: he managed to constantly balance competing interests.

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