American President Donald Trump has warned Iran that “better be careful” after the defiant Middle East oil producer announced that it enhanced uranium enrichment limit and dropped the commitment under the multi-nation nuclear deal of the Obama era in 2015.

Reacting to Iran’s decision,  Trump reiterated: “Iran better be careful.”

“Because you enrich for one reason and I won't tell you what the reason is. But it's no good they better be careful”, the U.S President added.

The Trump administration walked out of the Iran deal last year.

According to Trump, “Iran is doing a lot of bad things” and is seeking automatic rights to produce nuclear weapons.

But “Iran will never have a nuclear weapon,” Trump asserted.

Iran’s move was not quite unexpected. It announced a partial withdrawal from the deal in May and set a 60-day ultimatum to the European signatories to ease sanctions on its banking and oil sectors or face its defiance.

The Iran nuclear deal, formally known as the Joint Comprehensive Plan of Action (JCPOA) was aimed at curbing the scale of Iran's nuclear program and not escalating it into a nuclear weapons program.

Iran’s logic of dumping nuclear deal commitments

As the latest in Iran news, Sunday Iran said it has started enriching uranium past the 3.67 percent limit and later updated that broke the enrichment limit and touched 4.5 percent on Monday. This was officially confirmed by Behrooz Kamalvandi, the spokesperson for Iran's Atomic Energy Organization.

Keeping uranium enrichment to 3.67 percent was a major commitment Iran made for the lifting the economic sanctions in 2015. That level was deemed safe for civil use of nuclear energy to generate power.

But that limit was not adequate to build a nuclear bomb. Breaching that ceiling can mean Iran is aiming weaponization of the nuclear program.  

Other major commitments by Iran in the deal was reducing the number of centrifuges by two-thirds and slashing the stock of enriched uranium by 98 percent

Iran's defiant line was articulated by President Hassan Rouhani back in May when he said Iran would not abide by many of the commitments enshrined in the nuclear deal including the curbs on the production of fissile material.

Iran blames its changed stand on Washington's own retraction from the agreement and slapping of economic, diplomatic and military measures on it.

Meanwhile, the International Atomic Energy Agency' (IAEA) said its inspectors will verify Iran's new claims of enhanced uranium enrichment.

According to IAEA spokesman Fredrik Dahl, the agency will direct its inspectors to verify the factual position about the announced development.

Iran is facing intense pressure from Washington and allies. The recent attacks on oil tankers in the Persian Gulf and downing of the U.S drone have been blamed on Iran and the rhetoric has escalated Iran’s divide with Washington. 

A few days ago, the British forces seized an Iranian tanker in the U.K. territory of Gibraltar when it was allegedly carrying oil to Syria in violation of the European Union sanctions.