Regarding grammar and based on the text, check the following...

Nicolson, H. (1963) (3rd edition) Diplomacy.
Oxford: OUP, with adaptations.
Another correct preposition used with the verb “Compared” (line 2) is with, as in “to compare with”.

Nicolson, H. (1963) (3rd edition) Diplomacy.
Oxford: OUP, with adaptations.