The idea of introducing UN peacekeepers into the conflict zone in Donbas, unexpectedly backed by Russian President Vladimir Putin, in the context of low confidence in the Russian side, must be carefully analyzed and backed with additional warnings, ex U.S. Secretary of State (2013-2017) John Kerry has said.

We must make sure that this is not some kind of trap, he said at the 14th annual YES conference in Kyiv on Friday.

In particular, among such warnings, Kerry called the issues of defining the border, the need to implement the Minsk agreements, as well as guarantees that Ukraine can determine its future without any limitations.

Kerry admitted that during his leadership the State Department was disappointed with the Minsk process, the lack of adequate reaction to the agreements in the Normandy format, and told Putin about the need to move faster.

He also said what happened in Crimea, where the Russian leadership lied, mustn't be pardoned.