Japanese government bonds and the yen have faced a sell-off recently on concern Takaichi's expansionary fiscal policy and the slow pace of interest rate hikes by the Bank of Japan could lead to additional debt issuance and too-high inflation.

After sliding near the psychologically important 160 to the dollar, the yen jumped suddenly on Friday after the New York Federal Reserve conducted rate checks, a move some traders saw as heightening the chance of joint U.S.-Japan intervention to halt the ailing currency's slide.

"I won't comment on specific market moves," Takaichi told a television programme aired by Fuji Television, when asked about the recent bond sell-off and the yen's declines.

"The government will take necessary steps against speculative or very abnormal market moves," she said without elaborating.

A weak yen has become a source of headaches for Japanese policymakers as it pushes up import costs and broader inflation, hurting households' purchasing power.

Takaichi has compiled a big spending package to cushion the blow from rising living costs and vowed to suspend by two years an 8% levy on food sales, triggering a spike in bond yields that increases the cost of funding Japan's huge public debt.

https://www.marketscreener.com/news/japan-pm-vows-to-act-against-speculative-market-moves-in-wake-of-yen-spike-ce7e5bdad18efe2d