Like any international conference, the CBI is a place for collaboration between researchers from all over the world. We were particularly keen to include colleagues from Eastern Europe and Russia, with whom we have cultivated a pleasant and rewarding relationship in recent years. This has been demonstrated not least by the fact that the CBI in 2019 was held in Moscow. We hope that the relationships that have developed on a personal level will continue.

While we will not exclude Russian colleagues per se from participating in this year's conference, we feel compelled to make a clear statement on the occasion of the shocking events in Ukraine. The CBI condemns the Russian government's criminal war of aggression in the strongest possible terms. It is not only a crime against the people of Ukraine, but a barbaric attack on basic values of civilisation.