Creo que la Unión Europea, cuyo territorio está afectado por aproximadamente un 50% de la nube radiactiva de Chernóbil ― utilizo el presente « está » de forma deliberada ― debe velar por sus propios intereses.
I believe that the European Union, whose territory is affected by roughly half of the fallout from the disaster – I use the present tense ‘ is ’ advisedly – must look to its own interests here.