Images: AP Composite: Mark KellyWashington has pledged to help Kyiv “for as long as it takes,” but support from European allies has been uneven. The states along the North Atlantic Treaty Organization’s eastern flank have stepped up to oppose Russia in the largest land war in Europe since World War II. But Germany and France have been more hesitant and less impressive. This underscores a new strategic reality to which the U.S. ought to respond by making hard decisions about where it positions its troops and resources in Europe. If Washington is serious about deterrence by denial, it needs permanent installations in the key frontier state: Poland.

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Persons: Paul Gigot, Jack Keane, Mark Kelly Washington Organizations: Kyiv, Russia Locations: Atlantic, Europe, Germany, France, Washington, Poland