As it happened: Obama addresses the US on Syria

Key Points

• US President Barack Obama has said the US must be prepared to strike Syria to deter "other tyrants" from using weapons of mass destruction
• But he said he recognised the US was weary of war and pledged he would not put American "boots on the ground"
• Russia's plan for Syria's chemical weapons to be put under international control has set off wrangling at the UN
• All times BST