The U.K. is stepping up its preparations for a military strike on Iran, the Guardian newspaper reported on Wednesday. According to the report, the U.K. is increasingly concerned over Tehran's nuclear program, and is preparing to deploy Royal Navy ships in the coming months to assist a possible U.S. attack on key facilities in Iran.

The paper cited senior officials who said they believed Iran had regained its technological capabilities which were severely damaged in a cyber-attack last year. Iran said the Stuxnet worm infected personal computers of employees at the Bushehr plant, but not the plant's main systems. The New York Times reported last January that the worm was a joint Israeli-U.S. effort to undermine Iran's nuclear ambitions.

Iran's military chief warned Wednesday that an Israeli attack on Iran's nuclear development sites will come at a heavy price, according to the Iranian ISNA news agency.

Responding to reports that Prime Minister Benjamin Netanyahu has been trying to gain a majority in the cabinet for an attack on Iran, the chairman of the joint chiefs of staff of Iran's armed forces, Hassan Firouzabadi, warned both Israel and the U.S. against such a move.

Meanwhile, the Israel Air Force continues conducting comprehensive drills on long-range attacks.

The last drill of this sort took place last week at the NATO base in Italy, in which six different types of air force squadrons participated. The drill was widely covered on websites around the world that specialize in aviation.

Also on Wednesday, Israel test-fired a ballistic missile at the Palmahim Israel Defense Forces base in central Israel. The test was part of an examination of a new missile currently being developed by the defense establishment. The missile left behind a fire trail that could be seen throughout central Israel.