speculation about capabilities

according to media a military uses satellite, drones and gunships to support a special operations unit in a hostile country 

so if an alien species that controls parts of a galaxy or an entire galaxy

recruited an individual on earth 

and used that individual as a deniable operator 

how much resources would that alien species be willing to use 

to protect that deniable operator 

and how much resources would that alien species be willing to use 

to ensure that deniable operator succeeds