Russia-U.S. tensions rise following missile attack on airbase

It's the first time the United States has admitted to deliberately attacking Syrian government forces in the six years of conflict there. Syria, Russia and Iran are among the countries that have condemned the U.S. attack, describing it as reckless and a violation of international law. Saudi Arabia, which supports the Syrian opposition, has welcomed the missile strike, calling it a courageous decision. Meanwhile, U.S. Secretary of State Rex Tillerson is due to arrive in Moscow on Tuesday. He's expected to put pressure on Russia for failing to prevent the alleged chemical gas attack.