Ukraine bolsters defences amid a possible invasion by Russia, as rhetoric from world leaders ramps up. U.S. President Joe Biden sends a stern warning to his Russian counterpart, as America sends more military equipment to Ukraine. Meanwhile, Ottawa orders families of diplomats in Ukraine to leave, as Ukrainian-Canadians in Kyiv weigh up what's next. Plus, British Prime Minister Boris Johnson fights for his political survival as police launch an investigation into pandemic parties at his residence. And the final destination - what will the world's most powerful telescope tell us about the universe?