A prayer service for peace in the East German city of Leipzig exactly 20 years ago triggered the chain of events that a month later led to the opening of the Berlin Wall.
Hungary has marked the 20th anniversary of a symbolic opening of the Iron Curtain, which once separated it from neighbouring Austria, amid warnings from churches that Europe remains divided.
A regional Protestant church in former East Germany has launched a special Internet blog to mark the 20th anniversary of rigged elections in May 1989 that led to protests which helped end 40 years of communist rule.
Christians in eastern Germany have launched a campaign to mark the 20th anniversary of the peaceful revolution that overthrew communism, with a light sculpture shone onto the walls of the regional parliament building in Erfurt.
The Czech government has agreed, after almost two decades of dispute, to compensate churches for properties confiscated under communist rule, and also to make them financially independent from the state. The details are being sorted.
President Putin has attended a memorial service conducted by Patriarch Aleksei II, head of the Russian Orthodox Church, at a church built near a Soviet police secret killing field, to commemorate the victims of Josef Stalin.
An East German Protestant who played a big role in the movement that led to the end of communism and the Berlin Wall in 1989, has warned against the church becoming seduced by the "friendly embrace" of capitalism.