The missions could have a bearing on your own future. A revolt in a foreign power might sound good (especially if they are a rival) but if their commoners start to have a better standard of living then your own peasants might get their own ideas.

A message such as 'Your peasants have seen the glorious revolution in......... and are starting to wonder if they too could benefit from a change in leadership'.

Maybe have to help out the old regime elsewhere to protect your own back?