A timeline of how the US and Europe have been at odds

The dispute between the United States and Europe over the future of Greenland isn't the first time the allies have been at loggerheads.

Deep disagreements have flared up from time to time since World War II, bringing trans-Atlantic diplomatic crises.

Here's a look at some of them.

Suez crisis

When France, the United Kingdom and Israel invaded Egypt in 1956, aiming to topple Egyptian President Gamal Abdel Nasser and take back control of the Suez Canal, the U.S. employed heavy diplomatic and economic pressure to stop it.

The U.S. intervention severely strained Washington's relations with London and Paris, which were key allies during the Cold War, and was a milestone in Europe's waning postwar influence.

Vietnam War

Street protests in Europe against the war had a significant political cost for the continent's governments, which had to reconcile their support for the U.S. with an erosion of their domestic popularity, and were a burden on trans-Atlantic relations.

Euromissile crisis

Russia's deployment of its new SS-20 missiles that could quickly hit targets in Western Europe compelled NATO to install U.S. Pershing nuclear-tipped ballistic missiles and cruise missiles in Europe in order to maintain the balance of the nuclear arms threat.

The move ignited an uproar on the continent, where fears of a new arms race deepened. Huge anti-nuclear peace demonstrations, with protesters often aiming their ire at Washington, filled the streets of European capitals in the 1980s.

Invasion of Iraq

Washington officials rebuked Paris and Berlin, with U.S. Defense Secretary Donald Rumsfeld referring to them as ''Old Europe'' and praising Eastern European countries as ''New Europe.''

Extraordinary rendition

As part of its ''war on terror,'' the United States captured and sometimes kidnapped suspects, and then transferred them to locations in countries where they were interrogated and often tortured outside the reach of U.S. law.

While some European governments were complicit in the program, a public outcry forced political leaders to denounce the practice.

War in Ukraine

Trump spoke warmly of Russian President Vladimir Putin, was cold toward Ukrainian President Volodymyr Zelenskyy, and then significantly reduced U.S. military aid for Kyiv.

Alarmed European leaders, who see their own security at stake in Ukraine, have pressed Trump to be on Ukraine's side.

National security strategy

The Trump administration set out a new national security strategy last December that portrayed European allies as weak.

It was scathing of their migration and free speech policies, suggested they face the ''prospect of civilizational erasure'' and cast doubt on their long-term reliability as American partners.

With relations between the U.S. and Europe deteriorating, Trump threatened the continent last July with heavy trade tariffs in what was seen as a deeply hostile move.