As eastern Ukraine is warned Russia will ramp up its offensive, people are dreading what's to come. The countries sending weapons to Ukraine; the Russian reinforcements apparently on the way to war-torn Mariupol; and the grim assessment from Austrian Chancellor Karl Nehammer after his meeting with Russian President Vladimir Putin. New research looks at the immunity of COVID-19 survivors and why they can catch the illness more than once, as Queen Elizabeth reveals what she endured after contracting it. Plus, Pakistan's latest political turmoil: why Imran Khan was ousted as prime minister, how Shehbaz Sharif replaced him, and the challenges Sharif faces. Also, smells like a lot of money: how one of Kurt Cobain's guitars is on the auction block. And one hell of a task for Turkmenistan: why the country is seeking to seal the smouldering crater known as the "Gates of Hell."