Tributes have been paid from across Europe to Joe Biden who announced on Sunday he was pulling out of the presidential race and endorsing his Vice President Kamala Harris to replace him at the top of the ticket. In a written statement, Biden said it had been the greatest honour of his life to serve as president and vowed to stay in the job until his term ends in January. “I will speak to the Nation later this week in more detail about my decision,” he said. From Ukraine, President Volodymyr Zelenskyy thanked Biden for his “unwavering support” in the two years since the Russian invasion. “We wi…