He told this to reporters at NATO headquarters in Brussels, Ukrinform reports citing Reuters.
Kellogg said nobody would impose a deal "on an elected leader of a sovereign nation".
He added that questions about whether Washington would provide guarantees for any future European peacekeepers would be addressed later.
It is noted that Britain, Sweden and Germany said they were open to sending peacekeepers to Ukraine, given a clear and acceptable mandate.
Many officials have stressed they would only consider sending troops to Ukraine if the U.S. provided a security guarantee.
Asked whether the U.S. would do this, Kellogg said: "Before any type of discussion and security guarantees is finalised, of course those discussions are going to take place. Answers to those questions will be determined as you come up with the final process."
As reported by Ukrinform, US Special Representative for Ukraine and Russia Keith Kellogg said that the participation of European countries in negotiations to end the Russian-Ukrainian war will be crucial.
British Prime Minister Keir Starmer said that Britain is ready and willing to deploy its troops to Ukraine if necessary as part of security guarantees.
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