US President Donald Trump is shaping his second term around an aggressively expansionist foreign policy, openly reviving the logic of the 19th-century Monroe Doctrine while warning rivals and allies alike that Washington is prepared to use force.
In a dramatic overnight operation, US forces reportedly detained the president of Venezuela and his wife from a heavily fortified compound in Caracas, a move Trump framed as the fulfillment of long-issued threats. Speaking afterward, Trump referenced the Monroe Doctrine of 1823 and rebranded it as the “Donroe Doctrine,” reaffirming US dominance over the Western Hemisphere.
In recent days, Trump has issued explicit warnings targeting several countries.
Greenland
Trump has renewed calls for US control over Greenland, citing national security concerns. The island hosts the US Pituffik Space Base and sits atop vast reserves of rare earth minerals critical to military and technological manufacturing.
He claimed the region is increasingly trafficked by Russian and Chinese vessels and argued US ownership is necessary to secure Arctic access as melting ice opens new shipping routes.
Greenland’s prime minister dismissed the proposal as unrealistic, while Denmark warned that any US military action against a NATO member would trigger a severe international response.
Colombia
Hours after the Venezuela operation, Trump warned Colombia to “watch itself,” accusing its government of enabling cocaine trafficking into the United States.
The remarks follow US naval strikes in the Caribbean and eastern Pacific, which Washington claims targeted drug-smuggling vessels. Trump has imposed sanctions on Colombia’s president and suggested military action would be “a good idea,” despite Colombia’s long history as a US security partner.
Iran
Trump also escalated rhetoric toward Iran, warning of severe retaliation if government forces continue killing protesters amid ongoing unrest.
Although Iran lies outside the Western Hemisphere, Trump has repeatedly threatened further action following last year’s strikes on Iranian nuclear facilities, which came after a broader Israeli campaign and led to a 12-day regional conflict.
Iran was a key topic during Trump’s recent meeting with Israeli Prime Minister Benjamin Netanyahu, where discussions reportedly included possible new attacks in 2026.
Mexico
Trump has again turned his focus to Mexico, accusing it of failing to stem drug trafficking and illegal migration. On his first day back in office, he signed an executive order renaming the Gulf of Mexico the “Gulf of America.”
While Trump described Mexican drug cartels as “extremely powerful” and suggested US action may be necessary, Mexico’s president has publicly rejected any US military intervention.
Cuba
Trump indicated that military action against Cuba may be unnecessary, describing the country as “collapsing” economically following the removal of Venezuela’s leadership.
Cuba has relied heavily on subsidized Venezuelan oil, and its leadership faces mounting pressure as those supplies are threatened. US Secretary of State Marco Rubio, a longtime advocate of regime change in Havana, has supported tougher measures.
Taken together, Trump’s statements signal a foreign policy defined less by alliances and more by raw leverage, with Washington asserting dominance through economic pressure, military force, and unilateral action. Whether allies tolerate this posture is an open question. Whether rivals believe him is the more dangerous one.
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