Kate Adie introduces stories from Greenland, Colombia and Greece.

President Trump has said the US needs to 'own' Greenland, to prevent Russia and China from taking it. Katya Adler has been in the capital Nuuk, speaks to Inuit women about the island's painful history of colonisation - and its now uncertain future.

Colombia has also been attracting attention from Mr Trump, following the recent US operation in Venezuela. This schism is out of step with decades of US foreign policy, but an on-going war of words between Colombia’s president, Gustavo Petro, and the US President on issues from migration to US strikes on fishing boats in the Caribbean, has put a strain on the relationship. Ione Wells report from Bogota.

A hot-button issue for Japan’s Prime Minister Sanae Takaichi is the problem of over-tourism. Visitor numbers have rocketed in recent years, leading to a rise in the tourist tax. But it’s not a problem being felt everywhere in the country. James Innes-Smith travelled to one prefecture where efforts to bring tourists back have fallen flat.

And finally, a landmark court case came to a close in Greece this week, in which a group of aid workers were put on trial after rescuing migrants from the Mediterranean. The 24 former volunteers have faced a range of charges, including human trafficking, money laundering, and facilitating the illegal entry of foreigners into Greece. Tim Whewell travelled to Lesbos, where he discovered how the migrant crisis that began in 2015 has shaped an entire community.

Series Producer: Serena Tarling