Cue

"Trump and his entourage will pass a painting showing Russian archers slaughtering their enemies in medieval battle. Next, he will enter an impressive palace room, its gilding as flamboyant and blinged-up as Trump Tower in Manhattan. There, a man of surprisingly small stature will receive the new US president. Cue warm smiles and a handshake. Putin makes a point of keeping everybody waiting, usually interminably, but you suspect that for Trump he will be bang on time." (The Guardian.)

What are "cue smiles and handshakes"?