Injunction request in a jurisdiction conflict concerning a declaratory action arguing the nullity of the Federal Government's participation in arbitration proceedings and the respective proceedings, which deal with compensation arising from "Lava-Jato" Operation. Allegation that the Federal Government, as controlling shareholder, is not bound by the arbitration clause in Petrobrás's bylaws. Issue that may only be assessed after a decision by the arbitral tribunal, which has not yet been constituted. Kompetenz-kompetenz principle. Impossibility of resolving the jurisdiction conflict: