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The White House and European leaders are trying to deter Russia from invading Ukraine. What happens if Vladimir Putin sends his troops in anyway? And the Federal Reserve is poised to raise interest rates soon. Will that help or hurt anxieties on Wall Street? Plus, soldiers in Burkina Faso say they have ousted the country's democratically elected leader. Why have there been so many coups in Western Africa in recent months?

President Biden is thinking about sending thousands of U.S. troops to Eastern Europe to deter Russia from invading Ukraine. Will the plan work or will it provoke Russian President Vladimir Putin? And cases of coronavirus are dropping rapidly in parts of the country. Why do scientists avoid saying we're near the pandemic's end? Plus, former vice-presidential candidate Sarah Palin is suing the New York Times. What does the case say about the freedom of the press to be wrong?

Francis Collins was director of the National Institutes of Health for more than a decade. He's also an evangelical Christian. Host Rachel Martin talked to Collins about some of life's biggest questions and how he's found answers with science and faith.

The diplomatic push to keep Russia from invading Ukraine is in high gear. President Joe Biden wants more semiconductor makers to follow Intel's lead and build factories in the U.S. Does omicron's relatively high transmissibility translate to the outdoors?

Secretary of State Antony Blinken presses his Russian counterpart over Ukraine. Anti-abortion rights activists mark the Roe v. Wade anniversary with new hope for a Supreme Court reversal. And healthcare experts press Spotify to police the platform's most popular podcaster over bogus COVID claims.

President Biden's voting rights priority meets defeat in the U.S. Senate. The U.S. won't send troops to Ukraine, even if Russia invades, so what are Kyiv's options? And days after a massive volcanic eruption, the international community struggles to bring relief to the island nation of Tonga.