Calls to "close the skies" over Ukraine — the rallying cry of pro-Ukraine demonstrations in early 2022 — are resurfacing after a wave of Russian airspace violations against NATO members. These incursions have put European countries on edge and raised questions about the alliance’s ability to counter Russian drones and aircraft. Within days, NATO launched the Eastern Sentry mission, and talk of closing the skies over Ukraine returned to the agenda. "NATO is a defensive bloc, so any steps it tak