The phrase "exercise a role" is correct and usable in written English.
It can be used when discussing the function or responsibility someone has in a particular context or situation.
Example: "In this project, the team leader will exercise a role in coordinating the efforts of all members."
Alternatives: "play a role" or "fulfill a role".
Moreover, you appear to take the story as an "inalterable truth", exercising a role as an accomplice in an international campaign orchestrated against Venezuela.
OsINV3 exercises a role in spikelet size determination mainly by regulating cell expansion, and in assimilate partitioning to grain by modulation of hexose-to-sucrose ratios during the initial phase of grain filling.
In fact, that is debatable, but even if it were true, one would still need to ask whether Britain should want to exercise such a role.
A preliminary federal investigation into the deaths of 11 harbor porpoises that washed ashore on the Puget Sound last May ended with scientists unable to determine whether a Navy sonar exercise played a role.
Endurance exercise plays a role in cardiovascular risk reduction, but may also be a risk factor for atrial fibrillation.
The pair spoke candidly about Obama's years in the White House, maintaining friendships, and how exercise played a role in both.
Perhaps acute increases in cardiac sympathetic nerve stimulation and increasing norepinephrine levels during exercise play a role in downstream silencing of MAO-A through non-canonical adrenergic pathways (Vidal et al. 2012).
Expression and localization were increased in chondrocytes and within the extracellular matrix after low-impact regimented exercise, indicating a role in signaling pathways through which chondrocytes respond to mechanical stimulation [ 43].
Once again, that's because exercise plays a role in neurotransmitters.
Turkey is an asset to its Nato partners when it is able to exercise a leadership role.
