Ukrainian President Volodymyr Zelenskyy delivers a virtual address to Congress.

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World leaders have addressed Congress many times, but Zelenskyy’s virtual speech will be a moment unlike any other. He’ll be a foreign head of state under siege from a global military power dialing in from an undisclosed location to address lawmakers still working under the restrictions of a lingering pandemic.

Zelenskyy’s virtual address starts at 9 a.m. It won’t be held in the brightly lit, ornate House chamber that has served as the backdrop to important speeches from global leaders and larger-than-life historical figures. Instead, it will be in the Capitol Visitor Center Congressional Auditorium, a relatively unremarkable venue bathed in dark wood paneling. Members of Congress who are not fully vaccinated must don a mask.

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