Kate Adie introduces dispatches from Germany, the Red Sea, Argentina, the Hungary-Serbia border and Costa Rica.BBC security correspondent, Frank Gardner takes us behind the scenes at the Munich security conference, where the sudden announcement of the death of Alexei Navalny brought home the diplomatic challenges facing world leaders.Iran-backed Yemeni Houthis say they will continue to target ships in the Red Sea, in solidarity with Palestinian people in Gaza. This has had a major impact on global shipping and the US and UK has retaliated with air strikes. BBC Persian’s Nafiseh Kohnavard has been given rare access to US navy warships patrolling in the Red Sea.In Argentina, President Javier Milei, has defended his huge public spending cuts after annual inflation in the country soared beyond 250 per cent. Our South America correspondent, Ione Wells, has been finding out what people in Argentina make of his controversial plans for change.Migration continues to fill headlines – from the ongoing saga of the Rwanda asylum plan to Republicans playing hardball over how to stem illegal crossings on the US-Mexico border. Our Central Europe correspondent, Nick Thorpe, is never far from a border flash-point, and reflects on the characters he has crossed paths with on the frontier of Hungary and Serbia.Costa Rica is often portrayed as a gold standard of eco-tourism and its Corcovado national park is one of the best places on earth to watch wildlife. But, there are concerns that some species there are in decline, in part due to illegal gold mining, hunting and logging in the region. Qasa Alom has been exploring the challenges.Producer: Sally Abrahams Production coordinator: Sophie Hill Editor: Richard Fenton-Smith