With Ukraine’s second-largest city bracing for a new Russian offensive, a growing number of NATO allies are backing Kyiv’s pleas to allow its forces to conduct strikes in Russian territory with Western weapons. This week Canada became the latest of at least 12 countries to declare that arms it has given to Ukraine could be used to hit military targets over Russia’s border. But the most important supplier of weaponry to Ukraine, the United States, remains reluctant to take the step, worried about provoking Russia into an escalation that could drag in NATO and set off a wider war. Without sign-off from Washington, the American-made long-range Army Tactical Missile Systems, or ATACMS, can only strike Russian targets inside Ukraine. Yet many Western leaders and military analysts say that with Russia massing thousands of troops on its side of the border — less than 20 miles from the northeastern city of Kharkiv — Ukraine badly needs the authority to strike inside Russia with Western weapons.

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Organizations: NATO, Tactical Missile Systems, Kharkiv — Locations: Canada, Ukraine, Russia’s, United States, Russia, Washington, Russian, Kharkiv, Kharkiv — Ukraine, Western