avgenie, EU OPS does require additional fuel for any flight to perform a safe diversion and landing most of the time normal flight planning exceeds those requirements due to abundance of diversion options. The foundation is anchored in EU OPS though under 1.255 Fuel requirements:
The minimum additional fuel, which shall permit:
(a) the aeroplane to descend as necessary and proceed to an adequate alternate aerodrome in the event of engine failure or loss of pressurisation, whichever requires the greater amount of fuel based on the assumption that such a failure occurs at the most critical point along the route, and
(i) hold there for 15 minutes at 1 500 ft (450 m) above aerodrome elevation in standard conditions; and
(ii)
make an approach and landing, except that additional fuel is only required, if the minimum amount of fuel calculated in accordance with subparagraphs 1.2. to 1.5. above is not sufficient for such an event 