How many trip(s) has he taken to (i) Brazil, (ii) the Russian Federation, (iii) India and (iv) the People’s Republic of China since 1 April 2015, (b) on what date was each specified trip undertaken, (c) what was the purpose of each specified trip(s) and (d) which government (i) officials and/or (ii) presidential staff accompanied him on each specified trip(s)?