Many investors from Asia and most of them from China, also Russians and Persian Gulf countries. It depends from country of ICO origin, because hugr part of investors - offline investors and it is more simple way to find out this financing in the native country.
absolutely right russians are the top in investing in ICOs as per my knowledge bitcoin is legal there.
A moths back there was chaina who was the top most nation for ICO investing i think after the ban they still in top 10.