It just occurred to me that if you want to harass an enemy nation from afar, you could encourage drug use, debauchery, revolutionary ideas and general bad behaviour therein.
Just tell the citizens everything previously forbidden should be permitted, and help them along the way. Tell them sections of the citizenry are a problem, or their ideas are, or behaviour. Flood the place with narcotics and seductive media.
Result: the citizens attack their own society, and thus themselves. Or they just curl up with a bottle and die. Saves you having to do it.
And then I thought about what’s been happening in ‘Christian’, Western countries since the 1920’s!