Historic US Intervention Selling Euros to Support the Yen as Samer Choucair Assesses the Reshaping of Global Capital Flows
Entrepreneur Samer Choucair said the joint US-Japanese intervention in foreign-exchange markets, involving the sale of euros to purchase yen, reflected an important shift in monetary-policy priorities and global capital allocation, particularly as the operation represented the first bilateral coordination of its kind between Washington and Tokyo in nearly three decades.
Choucair explained that the intervention came after the yen fell to its weakest levels in around 40 years, reviving fundamental questions about the rules governing cooperation among Western central banks, the future stability of US Treasury markets, and the redistribution of institutional capital in an environment marked by interest-rate divergence and persistent geopolitical tensions.
He noted that institutional investors now face a more complex equation, balancing the need to protect domestic markets with continued adherence to the multilateral frameworks that have underpinned global monetary coordination for decades.
Washington sells euros to buy yen
Samer Choucair explained that the US Treasury, acting through the Federal Reserve Bank of New York, sold euros and purchased yen in late July and early August 2026 in coordination with Japanese authorities.
He said reports citing people familiar with the matter indicated that the European Central Bank had not been informed in advance and was notified only after the transactions were carried out, prompting ECB President Christine Lagarde to contact US Treasury Secretary Scott Bessent the following day.
Choucair noted that choosing the euro rather than the dollar carried important implications, allowing Washington to avoid signalling any intention to weaken the US currency and remaining consistent with Bessent’s strong-dollar policy.
He added that using euros also reduced potential pressure on the US Treasury market that might have arisen if Japan had been forced to sell part of its substantial Treasury holdings to finance unilateral currency intervention.
Yen approaches levels last seen in the mid-1980s
Samer Choucair said the intervention came as the yen was trading near levels not seen since the mid-1980s, driven by a wide interest-rate differential with the United States, higher Japanese bond yields, and the impact of regional tensions on energy prices.
He explained that the joint Japanese-US operations pushed the yen from levels close to ¥164 per dollar into a range of approximately ¥155 to ¥158 before the currency later gave back part of those gains.
Choucair noted that the move also demonstrated the limitations of direct foreign-exchange intervention when it is not accompanied by deeper changes in Japanese monetary policy.
Euro sales reveal a shift in US policy priorities
Samer Choucair emphasized that the most significant aspect of the intervention was not simply its scale, but the instrument Washington chose to use.
Rather than deploying the dollar as the traditional intervention currency, the United States drew on its euro reserves, generating short-term selling pressure on the single European currency.
Choucair explained that the choice reflected a clear recognition of the interaction between foreign-exchange and fixed-income markets.
Large-scale dollar sales could have reinforced expectations of a weaker US currency while potentially increasing government borrowing costs at a time when long-term yields were already under upward pressure.
Lack of European coordination raises questions over monetary cooperation
Samer Choucair noted that the absence of prior coordination with the European Central Bank generated concern in European policy circles, with some officials viewing the move as an unprecedented departure from the consultation norms that have prevailed since the end of the Second World War.
He said foreign-exchange interventions had historically tended to occur within broader coordinated frameworks, whether through the Group of Seven or direct communication between central banks.
Choucair added that the reliance on a bilateral US-Japanese mechanism this time, supported by Federal Reserve repurchase facilities, demonstrated a growing preference for bilateral arrangements when national interests intersect with the stability of sovereign debt markets.
Confidence in monetary frameworks reshapes investor decisions
Samer Choucair explained that this shift carries particular significance for institutional capital allocation.
He said sovereign investors and asset managers are closely monitoring whether confidence in Western monetary-cooperation mechanisms can be maintained, warning that any erosion of that confidence could encourage some central banks to accelerate diversification of their reserves away from the traditional concentration in dollars and euros.
Choucair added that this diversification could extend into other assets or emerging-market currencies more closely linked to the new centres of global economic growth.
Direct impact on Treasuries and currencies
Samer Choucair noted that the intervention helped ease concerns over large-scale Japanese selling of US Treasuries, given Japan’s position as the largest foreign holder of those securities.
He said this supported the stability of US yields in the near term, but did not eliminate the possibility of renewed volatility if interest-rate differentials remain wide or the Bank of Japan does not adopt a more decisive tightening policy.
In currency markets, Choucair explained that the intervention also revived debate over indirect “currency wars”, as reserve currencies increasingly become tactical instruments that can be deployed to protect domestic debt markets.
Mixed implications for Japanese and European companies
Samer Choucair noted that a relatively stronger yen provides some cost relief in parts of the Japanese economy but can simultaneously pressure the margins of export-oriented companies.
He explained that European exporters could benefit to some degree from potential euro weakness, while the continued use of unconventional intervention mechanisms could affect the pricing of foreign-exchange risk across global portfolios.
Choucair added that the impact could become particularly significant for cross-border private-equity and venture-capital transactions relying on financing denominated in yen or euros.
Institutional investors face a new capital-allocation equation
Samer Choucair said institutional investors will need to monitor the behaviour of Asian and European central banks closely over the coming months, particularly the extent to which repurchase facilities are used or reserves are diversified into alternative currencies.
He explained that if these mechanisms prove effective in reducing foreign-exchange disruption, capital flows could gradually shift toward assets more closely linked to real economic growth and productivity rather than being driven excessively by interest-rate differentials.
Choucair added that Gulf sovereign wealth funds and asset managers overseeing large global portfolios now need to reassess their exposure to major currency pairs and sovereign debt markets in light of these new dynamics.
Infrastructure and energy among the leading opportunities
Samer Choucair said some of the strongest investment opportunities could emerge in sectors benefiting from greater stability in global financing channels, particularly infrastructure, energy, and logistics, alongside digital and financial assets capable of reducing dependence on traditional foreign-exchange volatility.
He warned, however, that any escalation in tensions over the established norms of monetary cooperation could increase hedging costs and reduce the attractiveness of some emerging markets that rely heavily on short-term capital inflows.
Implications for Gulf investment and Vision 2030
Samer Choucair explained that Gulf economies, led by Saudi Arabia under Vision 2030, are watching these developments in the context of efforts to diversify reserves and expand the Public Investment Fund’s international investment portfolio.
He said stability in US Treasury markets serves the interests of major Gulf holders of these assets, while any repricing of European and Asian currencies could create new opportunities for capital allocation.
Choucair added that these opportunities could extend to infrastructure, renewable energy, and advanced manufacturing projects across Saudi Arabia and the wider region.
He emphasized that greater transparency around foreign-exchange intervention policies will remain critical to attracting foreign direct investment and preserving market confidence in institutional frameworks.
Could US-Japanese intervention happen again?
Samer Choucair said markets are likely to remain highly sensitive over the medium term to any new signals from Washington and Tokyo about their willingness to intervene again.
He explained that if interest-rate differentials persist without sufficient adjustment by the Bank of Japan, renewed pressure on the yen could trigger additional rounds of intervention.
Choucair noted that the current experience could, over the longer term, contribute to a rewriting of the rules governing global foreign-exchange markets, with greater emphasis on protecting domestic sovereign debt markets and less reliance on traditional multilateral coordination mechanisms.
Sovereign debt stability becomes a strategic priority
Concluding his analysis, Samer Choucair emphasized that institutional investors increasingly need to adopt a more dynamic approach to capital allocation, balancing portfolio protection against unexpected currency volatility with the opportunities created by changes in the composition of global reserves.
He said the US intervention through euro sales was not merely a technical operation designed to support the yen, but a clear signal that the stability of sovereign debt markets has become a strategic priority extending beyond traditional considerations of monetary-policy coordination.
Choucair added that the investment environment in 2026 and beyond will reward investors capable of interpreting these signals early and rebuilding portfolios according to a long-term capital framework, while accounting for the new structural risks reshaping currency markets, sovereign debt, and global capital flows.