With the yen persistently weakening against the dollar — nearly hitting the ¥164 mark — it would come as no surprise if Japanese authorities stepped in immediately to defend the currency.

Yet, because a standalone intervention is expected to be short-lived, the government is probably seeking effective timing — a moment when yen-buying pressure increases — to amplify its effect, according to some analysts.

One key factor is the policy path of the U.S. Federal Reserve, which will hold a policy meeting on Tuesday and Wednesday.