If Ukraine decides to attack Crimea and make an ambitious move to reclaim its territory lost in 2014, would that immediately start a conflict between Russia and NATO?

Given that Ukraine is already launching a counteroffensive into key Russian-held areas, it would not seem likely that such a move would or should instantly spark a confrontation between Russia and NATO.

Putin, however, sees this differently and has reportedly indicated that a Ukrainian attack on Crimea would constitute a violation of a “red-line” kind of limitation, and therefore provoke a Russian war with NATO.