Factbox: Japan steps up yen intervention rhetoric, as it has in the past

(Reuters) - Expectations are growing that Japanese currency authorities may intervene in the currency market after they explicitly warned they would do so, worried that the yen's rise to its highest levels in a year and a half will threaten the already sluggish economy.

Japan's currency intervention tends to follow verbal intervention by Finance Minister and other ministry officials.

Below are comments from Japanese officials in recent weeks, as well as those that preceded Japan's bouts of unilateral intervention in 2010. Japanese authorities have stayed away from the markets since they last intervened in 2011.

2016

May 10 (U.S. dollar = 109.27 yen)

Finance Minister Taro Aso, in a parliamentary committee:

"Japan obviously will intervene if one-sided moves persist."

"We're determined to prevent such one-sided moves from accelerating," saying the yen's gains earlier in the month was "quite rapid".

May 9 (U.S. dollar = 108.32 yen)

Aso, in a parliamentary committee:

"For Japan, excessive volatility in yen moves that affect Japan's trade, economic and fiscal policies - be it yen rises or yen falls - is undesirable. If such moves occur, Japan is ready to intervene in the market."

May 5 (U.S. dollar = 107.26 yen)

Prime Minister Shinzo Abe, in a news conference:

"We've seen some rapid and speculative moves in currency markets recently ... We will watch currency moves carefully and take action as needed."

May 4 (U.S. dollar = 107 yen)

Aso, in a news conference:

"One-sided, abrupt movements could have adverse impact on the economy, which is not desirable."

April 30 (U.S. dollar = 106.45 yen)

Aso, to reporters:

"This is not something that will restrain our response on currencies," saying any Japanese action in currency markets will not be constrained by the United States adding the country to a new monitoring list over foreign exchange policies.

April 19 (U.S. dollar = 109.21 yen)

Aso, to reporters:

"Rapid currency moves, whether up or down, are unwelcome and stable currencies are most desirable...We will take various measures against a rapid yen rise or fall."

April 8 (U.S. dollar = 108.08 yen)

Aso, to reporters:

"Recent forex moves are one-sided....We will take necessary steps against forex moves as needed...Rapid forex moves are undesirable."

April 6 (U.S. dollar = 109.79 yen)

Abe, in a U.S. media interview (WSJ):

"Whatever the circumstances, we must definitely avoid competitive devaluation, and I think we should refrain from arbitrary intervention in currency markets."