President Donald Trump hosted the leaders of Armenia and Azerbaijan at the White House on Friday, where they finalized a peace agreement that would grant the United States exclusive development access to a critical transit corridor in the South Caucasus,

Armenia still must amend its constitution to remove a reference to Nagorno-Karabakh, Azerbaijan's ambassador to Britain said.

The leaders of Azerbaijan and Armenia signed an agreement aimed at ending decades of conflict as they were hosted by President Donald Trump at the White House on Friday. Azerbaijan's President Ilham Aliyev and Armenian Prime Minister Nikol Pashinyan shook hands after the US president described the event as "historic".