Russians will now need passports rather than just identity documents to enter Ukraine
Ukraine tightens rules for Russians entering country
Ukraine's government on Tuesday announced tough new rules limiting the documents Russians can use to enter the country in a move likely to stoke further tensions between Moscow and Kiev.
From March 1 Russians will no longer be able to enter Ukraine on their internal identity documents and will instead require a passport for overseas travel, a government decree said. Surveys estimate that over 70 percent of Russians do not possess such a document.
"This will allow us to considerably reinforce (border) checks and ensure Ukraine s national security," said Prime Minister Arseniy Yatsenyuk.
Russians could previously travel to Ukraine for 90 days on their identity card or a birth certificate for a child.
http://dunyanews.tv/index.php/en/World/259284-Ukraine-tightens-rules-for-Russians-entering-count
Of course, Ukraine has no way to enforce this in the eastern part of the country. If it did, the new rule would probably cut down on the number of 'volunteers' fighting with the separatists in the east.
I wonder what documents Ukrainians need to enter Russia. Most countries have reciprocal agreements on things like this.