I've been working on this for ages in various countries: the story of the intelligence buildup to Putin's 2022 invasion. How did the US and Britain find out so much, and why were Europe and Ukraine sceptical.
It's a long one:
www.theguardian.com/world/ng-int...
Drawing on more than 100 interviews with senior intelligence officials and other insiders in multiple countries, this exclusive account details how the US and Britain uncovered Vladimir Putin’s plans ...