Russia's president, Vladimir Putin, says his country bears "moral responsibility" for the Soviet Union's crushing of the Hungarian Revolution 50 years ago.
Mr. Putin made the comment in Budapest Tuesday after meeting his Hungarian counterpart, Laszlo Solyom.
Tens of thousands of people were killed in 1956 when Soviet troops crushed Hungarian forces who had overthrown a Soviet-imposed communist government.
Mr. Putin's trip was to include a ceremony marking the return to Hungary of centuries-old books seized by Soviet troops during World War II.
Officials from both sides were also set to discuss cooperation on nuclear power and Russian exports of natural gas and oil.
Wednesday, Mr. Putin is to travel to Prague for talks with Czech officials.
Some information for this report was provided by AFP and AP.