We can't trust Putin, but the US & EU can learn from their Crimea's mistakes. Sanctions back then were too soft and allowed Putin to prepare for this war. Keep the economical pressure on, go further, make it smarter and as painful as possible for the regime. But I am not convinced of the strategy, especially when we are not giving Ukraine any game changing war material. We are just giving them enough to keep fighting and bleed Russia dry. But this might take forever. A determined occupation power can keep on for years if they aren't forced out. The Israeli “Operation Peace for the Galilee” wasn't supposed to turn into a 20 years occupation of south Lebanon with countless massacres of civilians. And Israel only recognised it as a war 38 years after the invasion and 20 years after the 2000 withdrawal (another similarity with the Russia, still calling this "special operation").