Four Venezuelan oil tankers reportedly return to port after operating in "dark mode" as the U.S. seizes vessels amid Trump's push to acquire oil.

Environmental experts warn that U.S. plans under President Donald Trump to restart and control Venezuelan oil exports could intensify pollution, greenhouse gas emissions and ecological damage in a country already burdened by decades of oil-related degradation.

“The Venezuelan bolivar lost 99.8% in the last 10 years against the U.S. dollar, the Turkish lira lost 80%, the Argentina peso around 94.5%,” said Tether CEO Paolo Ardoino at a recent crypto conference. “That is, in one simple chart, the reason why USDT is successful.”

U.S. forces boarded another Venezuela-linked oil tanker in the Caribbean on Friday, according to U.S. Southern Command. This is the fifth oil tanker to be seized by the United States and the third in the last three days.

Venezuela’s oil industry has been in the spotlight since President Donald Trump captured the country’s President Nicolas Maduro.

NBC News' Tom Llamas spoke to Secretary of Energy Chris Wright who responded to some backlash from politicians over the recent U.S. military operation in Venezuela, and spoke on the future of the country's oil and the relationship between the two countries.

But according to international statistics, the country with the largest oil reserves is Venezuela, with 300 billion barrels worth. At their peak they produced over 3.5 million barrels of the stuff per day.