Moscow has urged Kyiv not to implement a decision requiring Russian citizens to show foreign-travel passports in order to enter Ukraine.
The Ukrainian Foreign Ministry announced on February 3 that for security reasons, as of March 1 Russians would no longer be able to use domestic identifcation documents known as "internal passports" to cross the border.
The Russian Foreign Ministry said on February 4 that it believes it is important that Kyiv maintain the current border-crossing rules for Russian citizens for "humanitarian reasons."
The ministry said Russia had not yet received official notification from Ukraine about the change, which Ukrainian Prime Minister Arseniy Yatsenyuk signed off on in a decree on February 3.
The change will require thousands of Russians who live or work near the Ukrainian border and cross it often to apply for passports.