The US National Defence Strategy has unveiled a reshaping of American security priorities across the globe. China is no longer seen as a primary threat, with US homeland and Western Hemisphere considered the main areas of focus. But what does that mean for Europe and NATO? Sky's defence analyst, Prof Michael Clarke, considers the implications. Ukraine latest: https://news.sky.com/story/barbaric-attack-on-ukraines-largest-cities-during-peace-talks-further-negotiations-expected-as-early-as-next-