Leaders of Japan, Germany, Brazil and India — the G4 that wants expansion of the U.N. Security Council and permanent seats for themselves — are exploring the possibility of a summit meeting in New York in the last week of September, on the sidelines of the U.N. General Assembly (UNGA).Prime Minister Narendra Modi, German Chancellor Angela Merkel, Japanese Prime Minister Shinzo Abe and Brazilian President Dilma Rousseff are going to be in New York in the last week of September.