SAO PAULO (Reuters) -Re-exporting Brazilian coffee beans via third countries is not a strong alternative for getting past U.S. import tariffs, while the country's instant coffee industry has seen a significant drop in sales to the United States, industry leaders said on Tuesday. Brazil is the world's largest producer and exporter of coffee, while the United States is the world's largest consumer. President Donald Trump's decision to impose a 50% levy since the start of August on most Brazilian goods, including coffee, has roiled international coffee markets.