They were probably among the few to know. During his surprise trip to the front line in Bakhmout, soldiers had given Volodymyr Zelensky a signed flag, intended for the American Congress. A few hours later, the Ukrainian president was on his way to Washington, the flag placed in his luggage, for his first visit abroad. A visit kept secret until the last minute, while his country exceeds the threshold of the 300th day of war.