From TASS [Russian state agency]:

Polish officials say that are not abandoning the idea of deploying NATO peacekeepers to Ukraine, Russian Ambassador in Warsaw Sergey Andreev said on the Soloviov Live project on Saturday.

“As for the idea of a peacekeeping operation, everything seems clear: Americans said that they would not deploy their troops, the NATO secretary general said that NATO was not considering such an operation. However, [Polish] officials say that they are not giving up on the idea, they will think, see and so on,” he said.