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Currency wars: the buzz word that dominated markets early last year threatens to make a comeback at the start of 2014, judging by a rise in official rhetoric from Japan's neighbors about a weak yen.
South Korea is "closely monitoring" the won and the continuing depreciation of the yen, the country's Finance Minister Hyun Oh-seok was quoted saying on Friday. The comments follow similar remarks earlier in the week from Chinese and South Korean officials.
(Read more: Yen set for worst year since YMCA topped the charts)
Perhaps it's no wonder that concerns about the yen's sharp fall, which gives Japanese exporters an edge over its competitors in overseas markets, have resurfaced.
The won on Thursday hit its strongest level in more than five years, contributing to a fall in South Korean stocks to a four-month low on Friday. The yen hit a 15-year low of around 5.7360 yuan on Thursday.
(Read more: The Asian market laggard could shine in 2014)
"You've got to understand what the threshold of pain for other Asian nations would be," said David Greene, had of dealing at AFEX Australia.
"From a technical perspective, 112 [for dollar/yen] is possible this year. Whether other Asian economies such as South Korea see that as negative for their own economies and start to play an intervention role or enter a currency war within the region remains to be seen," he said. "It's not something I would like to bet on as we don't know what central banks are going to do."
Verbal intervention from Japan's neighbors this week may have contributed to the bounce in the Japanese currency against the won, and U.S. dollar on Friday. The yen traded at about 104.36 to the greenback, off this week's five-year low around 105.44.
In early 2013, talk of currency wars, triggered in part by the yen's sharp fall, dominated currency markets. That was before another big theme of 2014 emerged – talk of an unwinding of U.S. monetary stimulus.
"It's really the yen crosses that we'll see a lot of the big moves in this year," Michael Woolfolk, managing director and senior currency strategist at BNY Mellon in New York told CNBC Asia's "Squawk Box. "
"It should put a lot of pressure on the emerging Asian currencies. We think they will push back, that there will be an escalation of currency wars and intervention is the most likely route," he added.
The yen declined almost 22 percent against the dollar last year against a backdrop of aggressive monetary easing by the Bank of Japan and broad strength in the U.S. currency on talk of Fed tapering. It was the worst performing major currency of 2013.
"The yen/won movements have not hit exporters significantly, but it does look like they [the South Korean authorities] are taking a pre-emptive approach so the noises they've made this week are not unusual," said Mizuho Corporate Bank Market Economist Vishnu Varathan.
"We're not looking at exceptionally strong currencies across emerging markets, so I think it will be just the export-focused north Asia that continue to make noise about their strong currencies," he added.
— By CNBC.Com's Dhara Ranasinghe; Follow her on Twitter