"Indeed, there are cases when the (mobilisation) decree was violated. In some regions, governors are actively working to rectify the situation," Kremlin spokesman Dmitry Peskov told reporters.

"Instances of non-compliance (with the decree) are decreasing. We hope this will speed up and that all errors will be corrected."

President Vladimir Putin last week announced the call-up of thousands of reservists for the conflict in Ukraine, sparking protests across the country and a rush among Russian men for the borders.

Answering questions from reporters, Peskov said, despite rumours to the contrary, no decision had been taken to seal Russia's external borders and introduce martial law in some border regions.

"I don't know anything about this. No decisions have been made for now," he said.