The Prime Minister issued a lavishly patriotic tribute after a Russian official reportedly dismissed Britain as "just a small island; no one pays any attention to".
David Cameron posted his impassioned riposte on Google+ at the end of the G20 summit in St Petersburg and signed off by saying he was "thinking of setting this to music".
Mr Cameron wrote:
The comments were initially delivered off-camera to the British press and then expanded upon at a media conference.
His remarks were immediately compared to a scene from hit film Love Actually, in which Hugh Grant's prime minister interrupts the US president to say: "We may be a small country but we're a great one, too."