Ukraine started negotiations with the European Union on joining the bloc on Tuesday, an important ambition of the country defending against a full-scale invasion from Russia. The negotiations are going to be “rigorous anddemanding,” Belgian Foreign Minister Hadja Lahbib said to open the talks, speaking on behalf of the EU. “With determination and commitment, we are confident inyour capacity to bring it to a successful conclusion,” she said. Joining the EU is a symbol that “thousands of the best sons and daughters of Ukraine have given their lives for,” Ukrainian Prime Minister Denys Shmyhal to…