Russian officials say Syrian President Bashar al-Assad is crucial to fighting the Islamic State, while President Obama has called on the embattled leader to step aside.
Whatever the merits of Tehran's case, lifting the 2007 UN embargo on the sale of conventional arms to Iran is just not going to fly in the United States.
Researchers have grown increasingly concerned by the threat that global warming poses to global peace. And political leaders are beginning to take notice.
The allegations by Amnesty focus on the battle waged in the divided city of Aleppo. The UN is hoping to revive peace talks at which Iran and Turkey – but not Islamist rebel forces – will be represented.