KYIV, Aug. 27 - U.S. national-security adviser John Bolton said there is no need for President Volodymyr Zelenskiy to "rush" into any course of action regarding Russia’s involvement with separatist forces in eastern Ukraine, RFE/RL reported Tuesday.

"I think, from the perspective of a new government in Ukraine, President Zelenskiy would be well-advised to look at how to unfold a strategy of dealing with the Russians very carefully," Bolton said in an interview with RFE/RL.

“I don't think there is any reason to rush it into one course of action or another…. I think working this through over a period of time makes sense for the new government in Ukraine."

"I don't suppose that the Europeans are going to have a solution that is readily apparent," he added in reference to the so-called Normandy format of negotiations aimed at ending the Ukraine conflict.

More than 13,000 people have been killed in eastern Ukraine after Russia-backed separatists took up arms against government forces in the Donetsk and Luhansk regions in April 2014.

After being elected in April this year, Zelenskiy called for a four-way meeting with fellow Normandy format participants Russia, Germany, and France to revive peace talks with Kremlin leader Vladimir Putin.

Moscow has said there is interest in renewing peace discussions, but it did not specify a time frame.

On August 26, French President Emmanuel Macron said the Normandy format leaders will hold a summit next month.

"We think that the conditions exist for a useful summit," Macron said at the end of a Group of Seven (G7) meeting in the southwestern French coastal resort of Biarritz.

Asked if Washington would want to join in Normandy format talks, Bolton did not answer directly, but said there is "significant American interest" in existing issues between Kyiv and Moscow.

"I think that is why we should consider, if President Zelenskiy wants us to be involved [in talks with Russia], whether we should do it."

Bolton also voiced U.S. concern about Russia's military buildup in the Black Sea, including in Crimea, which has been unlawfully annexed by Moscow from Ukraine.

"The Black Sea has a number of NATO allies that also are part of it," Bolton said, adding, "We expect to see access across the Black Sea maintained for all the littoral states and other traders who use the Black Sea."

He said the United States was monitoring Russian activities in other parts of the world as well.

"The same is true of the Baltic; the same is true in the Arctic. And these are issues that we have had some difficult discussions with the Russians on, as in many other areas where they are trying to intrude beyond where they have a legitimate interest to be."

Bolton’s visit is the first to Ukraine by a top U.S. official since Zelenskiy’s election in April. He is scheduled to meet with the Ukrainian leader on August 28, according to local media reports.

Upon his arrival, Bolton told reporters that "for me, this is an opportunity to talk about some priorities we have and really also, because of the new administration here, to hear their priorities."

Bolton added that a meeting between President Donald Trump and Zelenskiy could happen when the U.S. leader travels to Poland early next month. (rfe/ez)