Joe Biden faces challenges from Russia and China as he aims to rebuild US leadership -
BBC News Joe Biden's first overseas trip as US president will be to the UK for the G7 summit in Cornwall in June. That will be followed by a NATO summit in Brussels, as he seeks to reassert America's global leadership amid rising tensions with China and Russia. Both countries have escalated their military activity recently - China around Taiwan - and Russia on the border of Ukraine. Reeta Chakrabarti presents BBC News at Ten reporting by world affairs editor John Simpson.