The respected author of a new book on Russia's full-scale invasion of Ukraine has told FRANCE 24 that he sees no peaceful solution to the conflict. Nicolas Tenzer is a non-resident senior fellow at the Center for European Policy Analysis and Chairman of the Center for Studies and Research on Political Decision. He says the West should have seen more clearly in early 2022 that Putin's war in Ukraine was inevitable. He believes the only way forward is to step up military aid to Kyiv. He joined us on Perspective.