(1) On which exact dates did he visit the Russian Federation in May 2015; (2) (a) how many government officials accompanied him on the specified visit, (b) what are the names of all non-government employees and persons who accompanied him on the specified visit and (c) what was the total cost of (i) flights, (ii) accommodation, (iii) travel within the Russian Federation and/or (iv) entertainment of the entire delegation during the specified visit?