(11)In setting the level of the Union-wide environment performance targets for RP4, consideration should be given to the historical performance achieved in that KPA; the estimated benefits resulting from measures set out in the European Route Network Improvement Plan (‘ERNIP’) referred to in Annex I to Commission Implementing Regulation (EU) 2019/123note; and, the consequences of Russia’s war of aggression against Ukraine on air traffic flows in the airspace.