North Korean leader Kim Jong-Un hailed a submarine-launched ballistic, declaring Pyongyang has the ability to strike Seoul and the US whenever it wants.
The missile launch came amid growing concern that Pyongyang is preparing a fifth nuclear test.
North Korea offered to impose a unilateral moratorium on nuclear testing if the United States suspends annual military exercises with South Korea.
The US and Britain denounced the test as a violation of UN Security Council resolutions and called on the North to refrain from further moves that could destabilise the region.
Reliance Industries has bought crude oil from Iran after a 6-year break and is looking to strike a long-term fixed quantity deal.
RIL, which operates the world's biggest refining complex at Jamnagar, is looking at quickly ramping up purchases to the earlier levels of about 5 million tonnes a year.
In January 2009, RIL had stopped exporting gasoline or petrol to Iran. And from February 2010, it stopped buying crude oil from the West Asian nation.