Zelensky doesn't miss opportunity to make fun of one willing to help
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"Today at 10:30 am at the entrances to Chernihiv, Hostomel and Melitopol there were heavy fighting. People died."
My reading of it is that he was frustrated that he had to be in a meeting while something important was happening to his people and he felt disconnected from them. To release that tension and passion he used some humour about how meetings are hard to schedule in a wartime.
I don't know the real situation though.