SEOUL • The won swung to a loss as the South Korean government warned about the currency’s ascent, the latest Asian nation to push back against foreign-exchange (forex) strength as investors jump on emerging-market (EM) assets.

The currency climbed against the dollar early yesterday before sharply reversing to sink as much as 0.7% as traders speculated that the government was in the market.

In response to a request for comment from Bloomberg News on the move, an official at the nation’s forex authority said that South Korea will take steps “sternly” in the case of one-sided moves in the won as the dollar weakens globally.

The official asked not to be identified because of policy.

The won was Asia’s best-performing currency last year, climbing almost 13%, as its economy benefitted from thriving exports and the central bank raised interest rates for the first time since 2011.

The Korean government may find that room to act against further advances will increasingly be limited as talks to revise a free trade agreement (FTA) with the US proceeds, according to Schroder Investment Management Ltd.

The currency had dropped to an intraday low of 1,069.80 per dollar, reversing an earlier gain to 1,058.80, with traders speculating that the swing was due to the authorities buying dollars in the market.

The whipsaw in the won comes as proposed talks between North and South Korea are set to start today.

The dialogue, announced last week, boosted investor sentiment with the suggestion that geopolitical tensions is easing.

The resumption of talks temporarily had led the won to strengthen past 1,060, according to An Young-jin, an economist at SK Securities Ltd.

“The currency is showing a one- sided movement,” said An. “Basically, it is a bit excessive.”

Still, further attempts to curb the won’s gains may be limited, analysts and investors said.

South Korea is on the US Treasury watch list of countries deemed at risk of engaging in currency manipulation, and in October the Asian nation agreed to amend a US FTA.

Going forward, the Bank of Korea may be in a “weak position” to bring down its currency as the FTA is negotiated, said Rajeev De Mello, head of Asian fixed-income at Schroder Investment Management in Singapore.

“The US administration has said it doesn’t want countries to weaken their currencies artificially.”

Jawboning

A broad dollar weakness has seen EM assets extend gains this year, spurring governments in Asia to attempt to talk down their currencies.

The Philippines and Thailand said last week that they were prepared to step in to manage volatility.

The Taiwan central bank said in December that it would step in to maintain an orderly market, while denying that it had conducted intervention.

“Since the start of the year, Asian currencies backed by strong trade and current account surpluses, particularly the Taiwanese dollar, Thai baht and Korean won have continued to strengthen,” said Heng Koon How, head of markets strategy, global economics and markets research at United Overseas Bank Ltd.

“It’s not surprising that local authorities may act to stabilise forex markets in the interim and prevent excessive strength.”

South Korean authorities boosted holdings of foreign-currency forwards and futures by the most in more than three years in November, according to data from the International Monetary Fund.

Citigroup Inc said there’s little to stand in the won’s advance to a 2008 high of 1,000 against the dollar with a buoyant global economy.

War is seen as unlikely, David Um — the MD of the markets group at Citibank Korea Inc — said in an interview before the currency move yesterday.

“For now, it’s confirmed the authorities won’t let spot fall to the 1,050 levels,” said Jeon Seungji, a currency analyst at Samsung Futures Inc.

While a strong support line will probably be created at the 1,060 level, foreigners are buying Korean stocks and a weak dollar trend continues, she said. — Bloomberg