In a free-wheeling speech to world leaders at the World Economic Forum in Davos, Switzerland, President Trump made a series of contested claims.

Trump touched on his desire to obtain Greenland from Denmark - which he referred to as a small ask, America's contribution to NATO, and wind energy in China.

His address - which lasted for more than an hour - contained a number of false assertions which BBC Verify has been looking at.

Did the US 'give Greenland back' after World War Two?

For weeks, Trump has spoken about his desire to acquire Greenland, a largely self-governing territory of Denmark. He has said it is critical to US national security.

At Davos, he said that after World War Two we gave Greenland back to Denmark, adding: How stupid were we to do that? But it was not America's to give back.

In 1933 an international court - a predecessor to the International Court of Justice (ICJ) - ruled that Greenland belonged to Denmark.

In 1941 - following Denmark's surrender to Germany the previous year - the US and Danish representatives signed an agreement allowing the US to defend Greenland to prevent the Nazis from taking it over.

This led to the construction of US bases on the island as well as the deployment of US troops. However, the agreement did not involve a transfer of sovereignty, meaning Greenland never became US territory.

Is the US paying for 'virtually 100%' of NATO's defence?

The US president criticised NATO and claimed that the United States was paying for virtually 100% of NATO. He said of the level of contributions from countries that are members of the military alliance: They didn't pay the 2% and now they're paying the 5%. Neither of these claims are correct.

In recent years US spending on defence accounted for about 70% of the total spent by NATO countries.

Has the US got nothing back from NATO?

Trump claimed that the US had never gotten anything from NATO and we've never asked for anything. The NATO website states that collective defence is NATO's most fundamental principle.

Does China have no wind farms?

Trump also criticised wind energy - a familiar target which he said was part of a new green scam. He singled out China, claiming that while it made lots of wind turbines, he had not been able to find any wind farms in China. This is false as China has one of the largest wind farms in the world at Gansu.

Does the UK take 92% of North Sea oil revenue?

President Trump also singled out the UK, claiming that they take 92% of North Sea oil revenue—this is incorrect.

Has Trump secured $18tn worth of investments for the US?

Trump claimed his administration secured commitments for a record-breaking 18 trillion dollars in investments. However, there is no publicly available evidence to support such figures.

In conclusion, this fact-checking process highlights the importance of scrutinizing statements made by public figures, ensuring that misinformation does not influence public consensus.