2017 Putin says US politicians are essentially elected puppets

(2017) Putin says US politicians are essentially elected puppets. Who are these ‘dark suits’ he’s describing?
"When a person is elected, they may have some ideas. Then people with briefcases arrive, well dressed, wearing dark suits, just like mine, except for the red tie, since they wear black or dark blue ones. These people start explaining how things are done. And instantly, everything changes. This is what happens with every administration."