US–Iran, Rubio, Navalny and Brazil's Carnival

The United States prepares for possible weeks‑long operations against Iran as President Donald Trump sends a second aircraft carrier to the Middle East. Secretary of State Marco Rubio pushes unity at the Munich Security Conference, while renewing sharp U.S. critiques of Europe. European allies blame Russia for killing Kremlin critic Alexei Navalny, saying tests found a rare toxin from dart frogs in his body. Plus, Rio bursts into Carnival as early blocos pack the streets. Listen to the On Assignment podcast What the world can learn from Aussie kids and the social media ban Listen to the Morning Bid podcast ⁠⁠here⁠⁠. Sign up for the Reuters Econ World newsletter ⁠⁠here⁠⁠.  Listen to the Reuters Econ World podcast ⁠⁠here⁠⁠. Visit the Thomson Reuters Privacy Statement for information on our privacy and data protection practices.  You may also visit megaphone.fm/adchoices to opt out of targeted advertising. Learn more about your ad choices. Visit megaphone.fm/adchoices