Much of the public discourse about arming Ukraine has revolved around whether the United States will send “long range” weapons. But that can mean different things.

Kyiv has been pleading with its allies to allow it to use donated arms to strike "legitimate" military targets deep in Russian territory, like the air bases used by Russian planes in their relentless bombardment of Ukraine.

Russian officials delivered dissonant statements in the past week about how Moscow would respond to Western weapons striking deep inside its territory, and whether such attacks will happen at all. Russian diplomats played on the now-familiar threat of a nuclear response.