Oil prices were in focus Tuesday as U.S. President Donald Trump ramped up threats towards Iran, shaking up markets subdued by holidays in Asia and the United States.

Iran's supreme leader warned on Tuesday that the country had the ability to sink a U.S. warship deployed to the Gulf, as fresh talks between the two sides concluded in Switzerland.

Iran said Monday that the U.S. position on Tehran's nuclear program "has moved towards a more realistic one" ahead of a second round of talks.

Israel's government has approved a process to register land in the West Bank as "state property", drawing condemnation from Arab nations and critics who said it would accelerate annexation of the Palestinian territory.

TV producer Dana Eden, who co-created the hit Israeli spy thriller series "Tehran", has been found dead in a hotel room in Athens, Greek police told AFP on Monday.

Iran's foreign minister arrived in Geneva ahead of a second round of negotiations with the United States, as the Revolutionary Guards on Monday begin military drills in the strategic Strait of Hormuz.

Some residents of Tehran on Sunday chanted slogans against the clerical leadership from balconies and windows, reports said, a day after Iranians abroad staged giant opposition rallies in Europe and North America.

Israeli Prime Minister Benjamin Netanyahu said on Sunday that any deal between the United States and Iran must involve the removal of all enriched uranium from Iran as well as Tehran's ability to enrich more.

Gaza's civil defense agency reported that Israeli strikes killed at least 11 people since dawn on Sunday, while a military official said the attacks were carried out in response to violations of the ceasefire.

The exiled son of Iran's last shah said he was ready to lead the country to a "secular democratic future" at a rally in Munich on Saturday, after U.S. President Donald Trump said a change of power would be the "best thing".