The visit began by honoring fallen Ukrainian soldiers, according to Ukrainian President Volodymyr Zelenskyy.
"We deeply appreciate this sign of respect from the alliance representatives towards our warriors who have defended our country and all of Europe from Russian evil," he wrote on X.
The visit had not previously been communicated externally, but was announced by Ukraine's state railway operator on Wednesday morning.
This comes the day after unusually large attacks on Kyiv, among other places. Tuesday's Russian attack killed at least 23 civilians, prompting Zelenskyy to once again call for more air defense from NATO allies.
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