DOHA, Qatar (AP) — The last World Cup clash between the United States and Iran 24 years ago is considered one of the most politically charged matches in football history.

This time, the political overtones are just as strong and relations perhaps even more fraught as the US and Iran face off once again on Tuesday in Qatar.

Iran’s nationwide protests, its expanding nuclear program and regional and international attacks linked back to Tehran have pushed the match beyond the stadium and into geopolitics.

No matter the outcome, tensions are likely only to worsen in the coming months.

When relations soured between the US and Iran depends on who you ask. Iranians point to the 1953 CIA-backed coup that cemented Shah Mohammed Reza Pahlavi’s power. Americans remember the 1979 US Embassy takeover and 444-day hostage crisis during the Iranian Revolution.

In soccer, however, the timeline is much simpler as this will be only the second time Iran and the US have played each other in the World Cup.

The last time was at the 1998 tournament in France — a totally different time in the Islamic Republic. Iran won 2-1 in Lyon, a low point for the US men’s team as Iranians celebrated in Tehran.

At the time, Supreme Leader Ayatollah Ali Khamenei praised the Iranian team, saying “the strong and arrogant opponent felt the bitter taste of defeat.”

But off the pitch, Iran’s then-president, Mohammad Khatami, sought to improve ties to the West and the wider world. Inside Iran, Khatami pushed so-called “reformist” policies, seeking to liberalise aspects of its theocracy while maintaining its structure with a supreme leader at the top.

US President Bill Clinton and his administration hoped Khatami’s election could be part of a thaw.

The two teams posed for a joint photograph, and the Iranian players handed white flowers to their American opponents. The US gave the Iranians US Soccer Federation pennants. They even exchanged jerseys, though the Iranians didn’t put them on. They later played a friendly in Pasadena, California, as well.

Fast-forward 24 years later, and relations are perhaps more tense than they’ve ever been.

Iran is now governed entirely by hard-liners after the election of President Ebrahim Raisi, a protege of Khamenei, who took part in the 1988 mass execution of thousands of political prisoners at the end of the Iran-Iraq war.

Following the collapse of Iran’s 2015 nuclear deal with world powers, sparked by President Donald Trump’s unilateral withdrawal from the accord, Tehran is now enriching uranium to 60 per cent purity — a short, technical step from weapons-grade levels. Non-proliferation experts warn the Islamic Republic already has enough uranium to build at least one nuclear bomb.

A shadow war of drone strikes, targeted killings and sabotage has been shaking the wider Middle East for years amid the deal’s collapse. Meanwhile, Russia pounds civilian areas and power infrastructure in Ukraine with Iranian-made drones.