Iranian Foreign Minister Mohammed Javad Zarif has suggested he is open to the idea of a prisoner swap involving British-Iranian mother Nazanin Zaghari-Ratcliffe, who was jailed in 2016.

The Trump administration on Monday told five nations, including allies Japan, South Korea and Turkey, that they will no longer be exempt from U.S. sanctions if they continue to import oil from Iran.

Watch: Iran's lawmakers wear Revolutionary Guards' uniforms to Parliament after the US named the country's military elite as a foreign terrorist organization.

"This action will significantly expand the scope and scale of our maximum pressure on the Iranian regime," the White House said in a statement.

Today is the third anniversary of Nazanin Zaghari-Ratcliffe's arrest on spying charges in Iran. The British-Iranian charity worker was detained at Tehran Airport while attempting to return home to London after visiting family.

With Persian new year around the corner, many Iranians struggle to finance the festivities because of the reinstated US sanctions.

Meet the Iranian 7-year-old who found internet fame completing the Mo Sala challenge

The Foreign Secretary has today decided that the UK will exercise diplomatic protection in the case of Nazanin Zaghari-Ratcliffe as part of the Government’s continuing efforts to secure her release.

Despite being at a 10-year low, Iran still executes the second-highest number of people in the world, according to a human rights group.

"We hope it doesn't go through," source tells Euronews.

When asked if there would be a military clash between Iran and the United States or Israel, the politician replied: "Well, certainly some people who were successful in creating a war last time are hard at it again."

While the US-sponsored conference focusing on Iran continues in Warsaw, the notable absentees from that event are holding their own meeting today in the Russian ski resort of Sochi.