By Mark Galeotti director of consultancy Mayak Intelligence and honorary professor at UCL School of Slavonic & East European Studies The next G7 summit begins on June 13 and will no doubt generate the usual statements of wholehearted support for Ukraine, and dark warnings that a Russian victory would mean terrible things for the world. Yet one key problem — and an abiding obstacle to the creation of any kind of meaningful strategy over the war — is that we do not have any kind of a common sense of quite what ‘victory’ or ‘defeat’ really mean. As a result, there has been no meaningful public de…