The props were simple, the message was clear. In a video address to the nation this week, Ukrainian President Volodymyr Zelenskyy held up his smartphone to the camera and started a timer app while an air raid siren blared.

¡°It lasted 20 seconds,¡± Zelenskyy said, after the wailing subsided. ¡°And we hear it for hours, days, weeks. Our people ... instantly take their children, help the elderly, and go to the shelters ... to survive, from Russian missiles, bombs.¡±

Sitting at his desk, unshaven and in his now trademark green shirt, Zelenskyy had in a few short sentences reminded 44 million Ukrainians that he was going through what they were, while renewing pressure on NATO to impose a no-fly zone.