Following President Joe Biden’s surprise visit to the Ukrainian capital of Kyiv on Monday, senior members of his administration detailed the security discussions that led up to the decision to go on the trip and the content of the meetings Biden had with Ukrainian President Volodymyr Zelenskyy over the course of his roughly five hours in the city.

And while the officials remained tight-lipped about the precise security details required to manage the trip, including Biden’s mode of transportation in and out of the war-torn country, they did say that the U.S. informed Russia of the visit shortly before Biden left for Ukraine.

“We did notify the Russians that President Biden would be traveling to Kyiv. We did so some hours before his departure for deconfliction purposes,” Jake Sullivan, the national security adviser to the president, told reporters on Monday morning in a press briefing.

“Because of the sensitive nature of those communications, I won’t get into how they responded or what the precise nature of our message was. But I can confirm that we provided that notification,” Sullivan said.

The planning for the trip was incredibly delicate, said John Finer, the U.S. deputy national security adviser, and began months prior.

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