The comment from Iran's mission to New York comes with fears of a wider regional war involving Israel and Lebanon's Hezbollah resistance movement. The two sides have engaged in near-daily exchanges of fire since the Israeli war on Gaza began.

Such exchanges have escalated this month, alongside bellicose rhetoric from both sides. Israel's army said plans for a Lebanon attack had been "approved and validated", prompting Hezbollah to respond that none of Israel would be spared in a full-blown conflict.

In a post on social media platform X, the Iranian mission said it "deems as psychological warfare the Zionist regime's propaganda about intending to attack Lebanon".

But, it added, "should it embark on full-scale military aggression, an obliterating war will ensue. All options, incl. the full involvement of all Resistance Fronts, are on the table."

Alongside Hezbollah's retaliatory attacks on northern Israel, rebels in Yemen have repeatedly struck commercial ships, related to Israel or its allies in the Red Sea area in solidarity with the Palestinians in Gaza, where Israel killed nearly 38,000, mostly children and women.

Teheran has not recognized Israel since the 1979 revolution that toppled Iran's United States-backed shah.

Fears of regional war also soared in April, after an Israeli air strike that leveled Iran's consulate in Damascus and killed seven Revolutionary Guards, two of them generals.

Iran hit back with an unprecedented drone and missile retaliatory attack on Israel on April 13-14.

Iran's state media later reported explosions in the central province of Isfahan as US media quoted American officials saying Israel had carried out strikes on its arch-rival.

Tehran downplayed the reported Israeli raid.