North Korean state media on Tuesday warned of a nuclear attack on the United States at any sign of a US pre-emptive strike as a US Navy strike group led by a nuclear-powered aircraft steamed towards the western Pacific.
Tension has escalated sharply on the Korean peninsula with talk of military action by the United States gaining traction following its strikes last week against Syria and amid concerns the reclusive North may soon conduct a sixth nuclear test.
North Korea's official Rodong Sinmun newspaper said the country was prepared to respond to any aggression by the United States.
"Our revolutionary strong army is keenly watching every move by enemy elements with our nuclear sight focused on the US invasionary bases not only in South Korea and the Pacific operation theatre but also in the US mainland," it said.
South Korean acting President Hwang Kyo-ahn warned of "greater provocations" by North Korea and ordered the military to intensify monitoring and to ensure close communication with the United States.
"It is possible the North may wage greater provocations such as a nuclear test timed with various anniversaries including the Supreme People's Assembly," said Hwang, acting leader since former president Park Geun-hye was removed amid a graft scandal.
The North convened a Supreme People's Assembly session on Tuesday, one of its twice-yearly sessions in which major appointments are announced and national policy goals are formally approved. It did not immediately release details.
But South Korean officials took pains to quell talk in social media of an impending security crisis or outbreak of war.
"We'd like to ask precaution so as not to get blinded by exaggerated assessment about the security situation on the Korean peninsula," Defence Ministry spokesman Moon Sang-kyun said.
Saturday is the 105th anniversary of the birth of Kim Il Sung, the country's founding father and grandfather of current ruler, Kim Jong Un.
A military parade is expected in the North's capital, Pyongyang, to mark the day. North Korea often also marks important anniversaries with tests of its nuclear or missile capabilities in breach of UN Security Council resolutions.
Groups of men and women in colourful outfits were singing and dancing on street corners in Pyongyang, which was illuminated by better lighting than in previous years, apparently practising for the parade planned for later in the week. Syrian President Bashar al-Assad sent a message of congratulations to mark the event, lambasting "big powers" for their "expansionist" policy.
"The friendly two countries are celebrating this anniversary and, at the same time, conducting a war against big powers' wild ambition to subject all countries to their expansionist and dominationist policy and deprive them of their rights to self-determination," the North's KCNA news agency quoted the message as saying.
"The two peoples of Syria and the DPRK are as ever struggling for their rights to self-determination and national sovereignty and the security and prosperity of their countries."
DPRK stands for the Democratic People's Republic of Korea, the North's official name.
The North's foreign ministry, in a statement carried by KCNA, said the US navy strike group's approach showed America's "reckless moves for invading had reached a serious phase".
"We never beg for peace but we will take the toughest counteraction against the provocateurs in order to defend ourselves by powerful force of arms and keep to the road chosen by ourselves," an unidentified ministry spokesman said.
North Korea and the rich, democratic South are technically still at war because their 1950-53 conflict ended in a truce, not a peace treaty. The North regularly threatens to destroy the South and its main ally, the United States.
North Korea is emerging as one of the most pressing foreign policy problems facing the administration of US President Donald Trump. It has conducted five nuclear tests, two of them last year, and is working to develop nuclear-tipped missiles that can reach the United States.
The Trump administration is reviewing its policy towards North Korea and has said all options are on the table, including military strikes, but US officials said non-military action appears to be at the top of the list.
Russia's foreign ministry, in a statement ahead of a visit by US Secretary of State Rex Tillerson, said it was concerned about many aspects of US foreign policy, and particularly concerned about North Korea.
"We are really worried about what Washington has in mind for North Korea after it hinted at the possibility of a unilateral military scenario," a statement said.
"It's important to understand how that would tally with collective obligations on de-nuclearising the Korean peninsula, something that is underpinned in UN Security Council resolutions."
Russia slammed US cruise missile strikes on a Syrian air base on Friday, calling them an illegal attack on a sovereign state.
The US Navy strike group Carl Vinson was diverted from planned port calls to Australia and would move towards the western Pacific Ocean near the Korean peninsula as a show of force, a US official told Reuters over the weekend.
US officials said it would still take the strike group more than a week to arrive near the Korean peninsula.
Trump and his Chinese counterpart, Xi Jinping, met in Florida last week and Trump pressed Xi to do more to curb North Korea's nuclear programme.
China and South Korea agreed on Monday to impose tougher sanctions on North Korea if it carried out nuclear or long-range missile tests, a senior official in Seoul said.
On Tuesday, a fleet of North Korean cargo ships was heading home, the majority of it fully laden, after China ordered its trading companies to return coal from the isolated state to curb coal traffic, sources with direct knowledge of the trade said.
The order was given on April 7, just as Trump and Xi were set for the summit where the two agreed the North Korean nuclear advances had reached a "very serious stage", Tillerson said.
Following repeated missile tests that drew international criticism, China banned all imports of North Korean coal on Feb. 26, cutting off the country's most important export product.
The North is seen ready to conduct its sixth nuclear test at any time, with movements detected by satellite at its Punggye-ri nuclear test site.
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Updated Date: Apr 11, 2017 18:06:59 IST