The U.S. has imposed sanctions on three nephews of Venezuelan President Nicolás Maduro. The move is the latest by President Donald Trump to increase pressure on Venezuela to stem the flow of illegal drugs into the United States. The sanctions, announced Thursday, target Franqui Flores, Carlos Flores and Efrain Campo, blocking their access to U.S. property and financial assets. The penalties also prevent U.S. companies and citizens from doing business with them. This follows the U.S. seizure of an oil tanker off Venezuela's coast. The U.S. has also conducted deadly strikes on alleged drug-smuggling boats, killing at least 87 people since early September.