US forces have seized a sixth oil tanker linked to Venezuela in the Caribbean Sea. The vessel, named Veronica, was boarded early in the morning "without incident," according to the US military. The tanker was defying President Donald Trump's "quarantine of sanctioned vessels," the US Southern Command said. "The only oil leaving Venezuela will be oil that is coordinated properly and lawfully," the Command added. Since recent US military actions against Venezuela and the attempted seizure of President Nicolás Maduro, Trump has shown interest in tapping Venezuela's vast oil reserves. Veronica sails under a Guyanese flag and left Venezuelan waters empty in early January, noted monitoring group TankerTrackers.com. The ship was previously registered in Russia under other names, according to the International Maritime Organization. Homeland Security Secretary Kristi Noem praised the Coast Guard’s role in the operation, saying it was executed flawlessly and in line with international law. This crackdown targets what is called the "dark fleet," over 1,000 vessels transporting sanctioned Venezuelan oil. It follows the US’s first sale of Venezuelan oil worth $500 million and Trump's call for $100 billion investment into Venezuela's energy sector. The tanker seizure occurred just before a White House meeting between Trump and Venezuela’s opposition leader Maria Corina Machado. Trump previously called her a "freedom fighter" but did not back her to lead Venezuela after Maduro, citing a lack of support inside the country.