Strait of Hormuz
Iran's first retaliation since the US and Israeli attacks on the country on February 28 was to close the Strait of Hormuz - a vital shipping lane for some of the world's most important oil-exporting countries and for the global economy. Iran effectively controls the strait and has, since the start of the war, attacked or threatened to attack ships attempting to pass through it.
Iran has agreed to gradually open the strait to traffic, but on Wednesday Iran closed it again, citing new large-scale Israeli attacks in Lebanon.
It is unclear which country or organization is intended to control the strait. Several analysts say it is highly unlikely that Iran would relinquish control of the waterway.
Sanctions
Iran is subject to extensive sanctions and has demanded that the US lift them all. The sanctions have hit an already struggling economy in Iran hard. A large part of Iran's state budget goes to maintaining its military doctrine and weapons arsenal.
The country's economic crisis triggered mass protests in January - protests that were crushed with deadly violence.
The US president has said during the war that a "regime change" has taken place in Iran - but it is considered unlikely that the US would completely lift sanctions.
Iran-backed militias in the region
The issue of Iran's funding of and ties to the Shia militia Hezbollah in Lebanon and the Houthi movement in Yemen, and Israel's military action against them, is not mentioned at all in the ten-point plan.
More than a hundred people were killed in Israeli attacks in Lebanon on Wednesday, which Israel says targeted Hezbollah. Pakistan, acting as mediator, has stated that the ceasefire includes Israel's war in Lebanon, but Israel and the United States say this is not the case.
Uranium enrichment
A continuing demand from Iran is US acceptance of uranium enrichment for civilian purposes, i.e. nuclear power plants. The US position, however, remains that Iran must suspend its uranium enrichment. Washington demanded on Wednesday that the uranium be handed over; otherwise the US will "dig it up".
