US prepares historic blockade against Iran and shakes global exchange rates

The US Treasury's announcement regarding unprecedented economic isolation measures against Iran and the strict blockade of the Strait of Hormuz imposes an immediate shock on global energy routes and directly reverberates across emerging markets. The promise of total commercial strangulation places geopolitics back at the center of investor concerns, demanding a cold reading of developments on imported inflation and risk appetite in global and local assets.

In this scenario of international tension, the Brazilian exchange rate already reflects external instability, with the commercial dollar quoted at R$ 5.1859, accumulating a 1.58% rise over the 7-day variation compared to the previous baseline of R$ 5.105, and sustaining a slight 0.43% advance over the 30-day horizon against the R$ 5.164 recorded in the middle of last month. This pressure on the American currency goes hand in hand with a resilient domestic inflation level, evidenced by the 12-month accumulated IPCA at 4.44%, an indicator that gains extra sensitivity in the face of any rebound in international commodity prices and petroleum derivatives.

This escalation of rhetoric and sanctions represents the third major external news to guide market sentiment in recent weeks, adding to a domestic environment already marked by widespread caution, as illustrated by the recent R$ 279 billion melt in the Brazilian stock exchange and systemic credit impasses recently analyzed in our archive. From the perspective of credit and liquidity cycles, supply shocks of this magnitude tend to contract global risk appetite, redirecting financial flows from emerging countries to traditional safe-haven assets and drastically altering the cost of international corporate borrowing.