Obama's big deal to work with Russia on Syria, explained

Late on Friday, the United States and Russia came to a massively important agreement: After months of seemingly failed negotiations, they agreed to a joint plan for ending the war in Syria.

The proposal, announced by Secretary of State John Kerry and Foreign Minister Sergei Lavrov, is incredibly ambitious. The basic idea is for the US and Russia to get the Syrian rebels and the Syrian government, respectively, to stop fighting each other temporarily — so the US and Russia can start jointly attacking both ISIS and an al-Qaeda-linked group...