Edward Luttwak thinks we might be headed for another Seven Years War

 From his article in Unherd today.

'Putin started the war on February 24 with an ultra-modern, high-speed, paralysing coup de main based on the soundest principles of “hybrid warfare”. This works beautifully in war games, and is beloved by beribboned generals who have never fought patriotic Europeans in arms. Having expected, therefore, to take Kiev in one day, and all Ukraine in three or four (that was, of course, the forecast of the CIA, too), Putin discovered abruptly that he could not.

'Because Putin did not stop then, he cannot stop now. We might be headed for another Seven Years’ War. It did not seem like that when the Ukrainians counter-attacked in August, and Putin briefly considered retreating to Donetsk and Luhansk, as he signalled overtly. Then seven months after starting his Six Days’ War, Putin finally mobilised the trained reservists he needed on day one.'