Eighteen months into Vladimir Putin’s war on Ukraine, two things seem clear. First, the war matters. After 15 years of failed Western responses to Russian aggression against Georgia and Ukraine, another failure to contain and deter Russia would have catastrophic consequences around the world.
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Donald Trump and Vladimir Putin attend their bilateral meeting at the G20 Osaka Summit in Osaka, Japan, on June 28, 2019. (Mikhail Svetlov via Getty Images)