have been fuelling
Present perfect progressive conjugation of fuel.

fuel

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Illicit transfers to State and non-State armed actors continue, including with the support of some Member States, mirroring regional rivalries that have been fuelling the instability.
Persisten las transferencias ilícitas a agentes armados estatales y no estatales, en ocasiones con ayuda de algunos Estados Miembros, en consonancia con las rivalidades regionales que han alimentado la inestabilidad.
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