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 ruled that Greenland belonged to Denmark.

In 1941 - following Denmark's surrender to Germany - 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. 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 criticized NATO and claimed that the United States was paying for virtually 100% of NATO.

He said of the level of contributions from countries which 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; that figure is decreasing, with projections of 62% by 2025 as more countries meet the 2% GDP target.

The 5% figure Trump referred to is a long-term aim, to be achieved by 2035.

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.

The US is the only member of the alliance to invoke Article 5, doing so after the 9/11 attacks, receiving significant support from NATO nations in subsequent military actions.

Does China have no wind farms?

Trump also criticized wind energy, claiming that although China made many wind turbines, he had not been able to find any wind farms in China. This is inaccurate, as China has one of the largest wind farms globally, such as the one in Gansu.

With significant investments and output, China generated more wind energy than any other country in 2024.

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

Referring to North Sea oil, Trump incorrectly stated the UK takes 92% of revenues. Oil companies there pay a 30% corporation tax, meaning the effective rate is about 78% on profits, not revenues.

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

Trump's claim of securing commitments for a record-breaking 18 trillion dollars lacks evidence. Recent figures suggest investments under his administration total around $9.6 trillion.

Experts have expressed skepticism on the viability of many investment pledges due to changing political circumstances.

This analysis sheds light on the complexities surrounding Trump's assertions, reflecting the challenges in obtaining an accurate portrayal of his statements.