US President Joe Biden has called on all American citizens remaining in Ukraine to leave the country immediately, citing increased threats of Russian military action. Mr Biden said he would not send troops to rescue Americans if ...

Citizens could be less safe if the UK has to leave key policing agreements after Brexit, Prime Minister Theresa May has warned EU leaders. The UK says EU negotiators are blocking agreement on tracking terrorists and sharing information after March 2...

  US president Barack Obama has said he may speak out after leaving office if he feels his successor Donald Trump is threatening core American values. By convention, former presidents tend to leave the political fray and avoid commenting on th...

  The BBC's Laura Trevelyan, who has lived in the US for the past 12 years, is applying to become a US citizen. That process includes a citizenship test. Here, she recounts her efforts to get up to speed. It's more than 25 years since I last t...