US President Donald Trump, who is determined to broker at least one peace deal between conflicting nations, declared Tuesday that he turned down his Russian counterpart, Vladimir Putin's, offer of help with the Iran-Israel conflict.

Instead, Trump reminded the Russian President that he needs his help to end the Ukraine war.

Speaking to a reporter aboard Air Force One en route to a NATO summit in the Netherlands, Trump claimed that Putin called him and asked, "Can I help you with Iran?"

The United States President said he shot back, "No, I don't need help with Iran. I need help with you."

Trump earlier warned arch-rivals Israel and Iran not to violate the ceasefire, which he claimed "is now in effect".

The US President on Monday claimed a ceasefire was agreed by Israel and Iran hours after Tehran attacked a US-run airbase in Qatar and Iraq in retaliation against Washington's strikes at three Iranian nuclear sites.

Iran launched the Annunciation of Victory, a mission that was focused on Al Udeid Air Base as a counter to the US strikes, according to the Islamic Revolutionary Guard Corps.

"With the aggression of the American enemy, it became clear to everyone that the evil of the Zionists was an extension of the American design," the Iranian armed forces said in a statement.

The attack came after the US on Saturday bombed Iran's three nuclear sites. The sites are Fordow, Natanz, and Esfahan.

B-2 bombers took off from Whiteman Air Force Base in Missouri in the early morning hours of Saturday (US time) to carry out the strikes.

The attack was carried out as the US joined the conflict that started a week ago when Israel launched airstrikes against Iranian nuclear and military sites, primarily targeting uranium enrichment facilities to prevent Iran from developing nuclear weapons.