Japan's massive foreign currency reserves, a priority war-chest for future yen interventions, have come under renewed scrutiny as Prime Minister Sanae Takaichi scours for funding to bankroll a controversial plan to suspend a consumption tax after her landslide election win. The focus on the $1.4 trillion stockpile, far larger than the annual state budget, underscores intense pressure on Tokyo to identify alternative funding sources for an estimated 5 trillion yen ($31.99 billion) annual revenue shortfall, a prospect that has unsettled financial markets.