Events unfolding in the Russia-Ukraine war this week represent the most dramatic escalation since the initial invasion in February. But however much we may not like the war, at this point it represents no threat to American national security. If Putin feels too threatened, he could genuinely consider resorting to tactical nuclear weapons. That makes it all the more important for Biden to stay resolved to keep the U.S. footprint in the war small. American national security is not presently at risk from the war between Kyiv and Moscow, and Biden must keep it that way.

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