What did european monarchs fear from france?

The thing that European monarchs feared from France is that revolutions would spread throughout Europe.

I hoped this helped a little bit :)

it further strained relations between the north and the south and convinced

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.