ICAO merely has recommendations regarding this issue, quoting from Annex 14 Volume 1 here:
1035m for independent parallel approaches
915m for dependent parallel approaches
760m for independent parallel departures
760m for segregated parallel operations
except that:
a) for segregated parallel operations the specified minimum distance
-may be decreased by 30m for each 150 m that the arrival runway is staggered toward the arriving aircraft, to a minimum of 300m
-should be increased by 30m for each 150 m that the arrival runway is staggered away from the arriving aircraft
b) for independent parallel approaches, combinations of minimum distances and associated conditions other than those specified in the PANS-ATM (Doc 4444) may be applied when it is determined that such combinations would not adversely affect the safety of aircraft operations
The 'staggering' clause was the reason that Frankfurt tried using '26L' in parallel to 25R, displacing the actual threshold of 25L to allow for shorter separation... They gave it up though, too much fuzz.