has impugned
Present perfecthe/sheconjugation ofimpugn.

impugn

Canada submits that applying these principles, Brazil has not made out a prima facie case against any of the programmes, activities or transactions it has impugned.
El Canadá alega que si se aplican estos principios el Brasil no ha fundamentado prima facie un caso contra ninguno de los programas, actividades o transacciones que impugna.
Consequently, the signing of this Treaty by Nicaragua may not be alleged as acceptance of arbitral awards that Nicaragua has impugned or whose validity is not definite.
En consecuencia, la firma de este Tratado por Nicaragua no podrá alegarse como aceptación de fallos arbitrales que Nicaragua haya impugnado o cuya validez no esté definida.
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