US President Donald Trump’s second term is increasingly defined by an assertive and confrontational foreign policy, marked by direct warnings to governments across the Americas and beyond.
The most dramatic signal came with a US operation in Venezuela, where Trump ordered the capture of President Nicolás Maduro and his wife in a high-risk overnight raid on their Caracas residence. In presenting the move, Trump invoked the 1823 Monroe Doctrine, recasting it as the “Donroe Doctrine” to underline what he described as Washington’s renewed determination to enforce US dominance in the Western Hemisphere.
Since then, the White House has issued a series of pointed messages to other countries viewed as falling within America’s strategic sphere of influence.
One of the most striking targets has been Greenland. Although the US already operates the Pituffik Space Base on the island, Trump has openly expressed interest in acquiring Greenland outright. He argues that control of the territory is essential for national security, citing increased Russian and Chinese activity in Arctic waters.
Greenland, an autonomous territory within the Kingdom of Denmark, occupies a strategic position in the North Atlantic and holds significant reserves of rare earth minerals, which are critical for advanced technology and defence industries. As climate change accelerates Arctic ice melt, the island’s importance is expected to grow further due to emerging shipping routes. Greenland’s prime minister, Jens Frederik Nielsen, firmly rejected Trump’s comments, calling any notion of annexation unrealistic and stressing that dialogue must respect international law.
In South America, Colombia has also found itself in Trump’s crosshairs. Shortly after the Venezuela operation, the US president issued a blunt warning to Colombian leader Gustavo Petro. Relations between Washington and Bogotá have deteriorated amid US accusations that Colombia is failing to curb drug trafficking. Trump has repeatedly criticised Petro, accusing his government of tolerating cartel activity, and has hinted that direct US action could be considered. This marks a sharp shift from decades in which Colombia was a central US ally in anti-narcotics efforts.
Iran, although outside the traditional geographic focus of the Monroe Doctrine, has also drawn Trump’s attention. Amid widespread protests in the country, he warned that Iranian authorities would face severe consequences if demonstrators were killed. The warning follows last year’s US strikes on Iranian nuclear facilities and renewed coordination with Israel, where discussions reportedly included the possibility of further action against Tehran in the coming years.
Mexico remains another focal point. Trump has revived hardline rhetoric on border security, drugs and migration, accusing Mexican authorities of failing to contain powerful criminal cartels. He has said drugs are flowing freely into the US through Mexico and suggested that military options remain on the table. Mexican President Claudia Sheinbaum has firmly rejected any US troop presence on Mexican soil.
Cuba has not been spared either. Long subject to US sanctions, the island’s economic vulnerability has increased following the fall of Venezuela’s government, which had supplied it with subsidised oil. Trump has suggested that Cuba is close to collapse and that direct US intervention may not be necessary. Senior US officials, including Secretary of State Marco Rubio, have echoed the view that Havana’s leadership should be deeply concerned about its future.
Taken together, these statements and actions point to a foreign policy built on pressure, unilateral action and a willingness to challenge long-standing diplomatic norms, signalling a turbulent period ahead for US relations with its neighbours and rivals alike.