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.

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