President Barack Obama is chairing a U.N. gathering of world leaders to discuss countering terrorism, a day after he and the leaders of Russia, China and Iran addressed the General Assembly on its 70th anniversary.<br />At Tuesday's meeting, the United States is rallying support for the fight against groups like the Islamic State, which is attracting foreign fighters who could return to their home countries to launch attacks.<br />Russia on Wednesday will chair its own meeting on countering extremism as this month's U.N. Security Council president.<br />Both countries laid out competing visions Monday on Syria's conflict.
