Is this the end of Europe? For years it dined off the deal of a lifetime: the US guaranteed its security if it acted as an outpost for American troops. Now a reckoning has come.
Nato is dying, warns new German leader
"Mission impossible": How one former French ambassador to the US described Macron's task of persuading Trump to support Ukraine in their meeting on Monday. Glossary
UN - United Nations. An intergovernmental organisation based in New York that aims to maintain international peace and security.
Friedrich Merz - A German politician and member of the Christian Democratic Union. He is expected to become the next leader after the recent German elections.
Nato - The North Atlantic Treaty Organisation was founded in 1949 to unite Western democracies in Europe and North America against the perceived growing threat of the USSR. It now has 31 members.
Ally - A person or group that cooperates with or supports another for a common purpose.
Right-wing - Sometimes referred to as 'conservative', this is a range of political beliefs that emphasise the value of tradition, individual freedom and responsibility, low taxes and a hands-off approach to government.
Holocaust - The murder of six million Jewish people in Europe by Nazi Germany. Members of other minority groups were also killed.
USSR - The United Socialist Soviet Republic, the USA’s main rival in the Cold War before it collapsed and broke up into a number of smaller states in 1991.
Autonomy - The right to make your own decisions.
Human rights - The basic rights and freedoms that belong to every person in the world, from birth until death. They apply regardless of where you are from, what you believe or how you choose to live your life. Some have called for animals and even natural phenomena like rivers to have some form of human rights.