The star contingent was high as Ukrainian First Lady Olena Zelenska held a "summit of first ladies and gentlemen" on Wednesday, focusing on the stigmatized issue of mental health in the war-torn country.

British comedian Stephen Fry battled with presentation slides, while French intellectual Bernard-Henri Levy lined up for coffee, and U.S. actor and director Sean Penn smoked a cigarette outside.

Zelenska, the wife of Ukrainian President Volodymyr Zelenskyy, has led a high-profile campaign encouraging Ukrainians to openly discuss mental health problems, titled: "How are you?"