Top U.N. leaders are unlikely to agree on aiming to resolve the issue of U.N. Security Council reform by the end of the year, Japanese Ambassador to the United Nations Kenzo Oshima said Thursday.

"Even if it is just a small number of countries that oppose the idea (of setting the end-of-year deadline), it would be difficult to coordinate everyone's opinions, and I do not think something that includes opposing views would be suitable as a final document," Oshima said in New York.

Japan, Brazil, Germany and India -- which are seeking to gain permanent seats on the Security Council -- have been hoping that the U.N. summit scheduled for Sept. 14-16 would adopt a document that calls for resolving the issue by the end of 2005.