DUBAI, March 26 (Reuters) - Iran’s initial response to the U.S. proposal to end the war, which was conveyed to Pakistan, was that it was "one-sided and unfair", a senior Iranian official told Reuters on Thursday, adding that a path forward might still be found if realism prevailed in Washington.

The official said the proposal "was reviewed in detail on Wednesday night by senior Iranian officials and the representative of Iran’s Supreme Leader".

For a decade or more, "America First" has been a rallying cry against foreign wars. But as US bombs fall on Iran, many of President Donald Trump's supporters are embracing a muscular campaign abroad -- and insisting it still fits the doctrine.

On the opening day of the Conservative Political Action Conference (CPAC) in the Dallas suburbs, attendees framed the conflict not as a departure from Trump's worldview, but as its natural extension.

Hunched against the cold and drizzle, Iraqi army medic Ahmed and two colleagues looked across the wreckage that just days ago was their clinic, now rubble after a strike on Wednesday.

"We're the only ones left of the medical unit," he said, his voice breaking with grief.

"They were all either killed or wounded."

Iraq has been drawn into the war sparked by US and Israeli strikes against Iran on February 28, which has since engulfed much of the region.

Diplomatic efforts to end the Iran war are gathering pace, even though Tehran continues to insist talks with the United States are not happening.

Here is what we know about the behind-the-scenes mediation efforts:

- What is on the table? -

After announcing "very good" talks with an unnamed "top person" in Iran on Monday, Trump said Tuesday that he had sent a plan and that it "all starts with, they cannot have a nuclear weapon".

PARIS, March 26 (Reuters) - The European Unions is worried about Ukraine being pressured by the United States into ceding territory in negotiations with Russia, the EU foreign policy chief Kaja Kallas said on Thursday.

"This is clearly a wrongapproach. It is, of course, the Russian playbook of negotiations, that they are demanding something that has never been theirs, and that's why we are also flagging that this is the trap that we should not walk into," Kallas said on the sidelines of a G7 meeting in France.

Fighting between Israel and Hezbollah on Thursday claimed casualties on both sides as Lebanon said it would complain to the United Nations Security Council over Israeli attacks.

In a sign of divisions, Lebanese ministers from Hezbollah and its ally Amal boycotted a cabinet session over the government decision this week to declare the Iranian ambassador persona non grata, as demonstrators rallied in support of Iran outside its embassy in Beirut.

By Mohammed Ghobari and Emma Farge

ADEN/GENEVA, March 26 - Yemen's Iran-aligned Houthi movement, whose attacks on the Red Sea caused international shipping and trade chaos during the Gaza war, stands ready to strike the key waterway again in solidarity with Tehran, one Houthi leader told Reuters, a move that would deepen a global oil and economic crisis brought on by the Middle East war.

March 26 (Reuters) - The United States, Israel and Iran have laid out maximalist positions to end warfare that has set the Middle East aflame and threatened the global economy by choking off Gulf energy supplies.

This is what the sides are saying about their positions in the conflict in which the U.S. and Israel have launched airstrikes on Iran since February 28 and Iran has carried out strikes against Israel, U.S. bases and Gulf states.

WHAT ARE THE AMERICANS SAYING?

U.S. President Donald Trump has passed a 15-point plan to Iran via Pakistan.

Iran's decision to rebuff a 15-point peace proposal from US President Donald Trump and outline its own conditions for a ceasefire reflects growing confidence in its negotiating position after nearly four weeks of war, analysts say.

Despite US-Israeli airstrikes that have killed its top leaders and inflicted huge material damage, Iran's governing system remains in place and it retains the ability to fire missiles and drones at its neighbours and Israel.

KUALA LUMPUR, March 26 (Reuters) - Malaysia's Prime Minister Anwar Ibrahim said on Thursday he had spoken to the leaders of Iran, Egypt, Turkey and other regional countries and said Malaysian vessels were now being allowed to pass through the Strait of Hormuz.

Anwar in a televised address thanked Iran's president for allowing the passage of Malaysian ships.

"We are now in the process of releasing the Malaysian oil tankers and the workers involved so that they may continue their journey home," he said.