Brazilian President Luiz Inácio Lula da Silva says he will impose retaliatory tariffs on the United States if President Donald Trump follows through on a pledge to boost import taxes by 50%.

Volatility in Brazilian assets soared as traders rushed to assess the endgame of President Donald Trump’s threat to impose 50% tariffs on all goods from the South American nation. A measure of one-month swings for the real jumped to the highest since April as the currency went from the worst to the best in emerging markets in the span of an hour.

President Donald Trump on Wednesday levied a 50% tariff against Brazil, which produces more than a third of the world's coffee, citing, in part, the country's treatment of former President Jair Bolsonaro,