No one will force a peace deal on Kiev. This was assured by Keith Kellogg, US President Donald Trump's envoy to Ukraine, reports "Reuters".
He indicated that questions about whether Washington would provide guarantees for a future European peacekeeping force would be considered later.
Senior US officials, including Secretary of State Marco Rubio - but not Kellogg - will meet Russian Foreign Minister Sergei Lavrov on Tuesday for talks focused on ending the war in Ukraine and Russia-US relations.
Kellogg will visit Ukrainian President Volodymyr Zelensky in Kiev this week. He told NATO headquarters in Brussels that no one would impose an agreement "on an elected leader of a sovereign nation."
Kellogg also reiterated that he was in talks with European allies who insisted on being included in the negotiations, but that he said it was impossible to get everyone to the table.
European officials were shocked by the Trump administration's moves in recent days to court Russia, which started a war in Ukraine almost three years ago and has triggered a series of Western sanctions.
Washington sent a questionnaire to European capitals asking what they could contribute to Kiev's security guarantees, which has made discussions among European allies on how to respond to the changing US policy urgent.
The leaders of France, Britain, Germany, Denmark, Poland, Italy, Spain and the Netherlands, as well as senior officials from NATO and the European Union, held an emergency meeting in Paris today.
Britain, Sweden and Germany have said they are ready to send peacekeepers to Ukraine if they are given a clear and acceptable mandate. Many officials have stressed that they would only consider sending troops to Ukraine if the United States provides security assurances.
Asked if the United States would do so, Kellogg said: "I have been with President Trump and the policy has always been: Don't take any options off the table".
"Before any discussions and security assurances are finalized, of course those discussions will take place," he assured. "The answers to those questions will be determined when the final process comes out."