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tokens: ACKNOWLEDGEMENTS This work was supported by the Russian Science Foundation grant 19-12-00423. We also acknowledge the support from the Academy of Finland travel grants 317552, 324550 (SST), and 322779 (JP), the Väisälä Foundation (SST), the Netherlands Organization for Scientific Research Veni Fellowship (AAM), the DFG grant WE 1312/51-1 (VFS), and the German Academic Exchange Service (DAAD) travel grant 57405000 (VFS). We grateful to the NuSTAR team for approving the DDT observation of A 0535+262.