The West didn't do anything much after Putin invaded and annexed Crimea, or instigated and assisted war in Ukraine's Donbass region, or earlier warred against tiny Georgia and gobbled up two chunks of their land, etc.
But the time to pressure, isolate and confront Putin was when he transformed the Russian political system from democracy to dictatorship. Instead the West pretended the change from Russian democracy to Russian autocracy was acceptable or tolerable, or wouldn't have consequences. (one consequence is Erdogan followed the same model and Turkey has backslid into a dictatorship, militarily meddling in other countries, such as Syria, Libya, etc.).
Or when Putin started assassinating journalists and opposition figures, and closed down independent media and ended civil society. When he was poisoning perceived enemies all the way in the UK. While crushing any political and civil society and non-gov't media at home. Russia morphing from a democracy to a dictatorship run by an ex-KGB officer was mostly met by a shrug.
Germany in particular thought you could just do business as usual with Russia.
Treating Russia as a normal country and not a pariah and dangerous threat. All of Putin's attacks, domestic and abroad, were largely ignored and accepted.
And this is where all that appeasement has led.
Crimea was 2014. Europe couldn't have started diversifying its energy sources and weaning itself off Russia petroleum 7 years ago?