Even with F-16 jets, "Ukrainian pilots would still have to fly very low anywhere near the front lines because of Russia's ground-based threat and that would limit effective missile range," Prof Bronk explains. "And it also means employing air power in the way the West did in wars like Iraq, Libya, Afghanistan, isn't possible in Ukraine."
If you've been trying to send messages via WhatsApp and they're not going through, you're not alone. The messaging app has been down for many users around the world for at least 30 minutes. Based on information from Downdetector -- and from Engadget editors' reports -- the service isn't working in several regions, including the US, Canada, parts of Europe like the UK and Italy, and Asian countries that include India, Malaysia, Japan and the Philippines. WhatsApp users either can't connect to the service at all or their messages get stuck with the loading wheel and aren't being delivered. Instagram and Facebook appear to be working just fine.
The Horn of Africa region is on the brink of an unprecedented humanitarian catastrophe, the United Nations and several aid organisations have said. Millions of people are facing food insecurity, as scientists and aid groups warned that Ethiopia, Kenya and Somalia could be experiencing their worst drought in 40 years this October-December with drier-than-average conditions predicted. In addition to delayed rains over the past two years, the Russian invasion of Ukraine has disrupted food supply globally and led to a rise in food and energy prices in the region. Here's all you need to know about the situation.