The spontaneous onset of the Euromaidan protests was a reaction of large parts of the Ukrainian population to the Yanukovych government’s sudden departure from the Association Agreement with the European Union in November 2013. There were several protests at the G20 summit that were legal and peaceful. The were some protests that were violent and therefor illegal.// In Hamburg, it was the violent protestors that were met with police action. In Moscow, the demonstrators were not violent, but were still met with police violence and detentions bit.ly/2rmgnsw, , bit.ly/2uZKvNs, . According to the constitution, citizens of the Russian Federation shall have the right to assemble peacefully, without weapons, hold rallies, mass meetings and demonstrations, marches and pickets bit.ly/2umCggt, , but the opposition usually doesn't get authorisation for their demonstrations.