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We, representatives of European institutes in the HADES Collaboration Board, have met Wednesday 23 March 2022. We are deeply shocked by the invasion of Ukraine perpetrated by the Russian army. In protest to this brutal aggression against a free and democratic country, our collaboration with Russian Institutes is stopped. It was also decided to remove, until further notice, the members of Russian Institutes from all the collaboration mailing lists and from the author list of the next publications. We have been obliged to take this decision, despite our longstanding and fruitful collaboration with Russian physicists, due to the unacceptable acts of the Russian Government.