NEW YORK/BEIJING (Reuters) - China’s proposed tariffs on U.S. liquefied natural gas and crude oil exports opens a new front in the trade war between the two countries, at a time when the White House is trumpeting growing U.S. energy export prowess.

FILE PHOTO: Chinese and U.S. flags are set up for a meeting during a visit by U.S. Secretary of Transportation Elaine Chao at China's Ministry of Transport in Beijing, China April 27, 2018. REUTERS/Jason Lee/File Photo

China included LNG for the first time in its list of proposed tariffs on Friday, the same day that its biggest U.S. crude oil buyer, Sinopec, suspended U.S. crude oil imports due to the dispute, according to three sources familiar with the situation.

On Friday, China announced retaliatory tariffs on $60 billion worth of U.S. goods, and warned of further measures, signaling it will not back down in a protracted trade war with Washington.

That could cast a shadow over U.S. President Donald Trump’s energy dominance ambitions. The administration has repeatedly said it is eager to expand fossil fuel supplies to global allies, while Washington is rolling back domestic regulations to encourage more oil and gas production.

“The juxtaposition here is clear: it is hard to become an energy superpower when one of the biggest energy consumers in the world is raising barriers to consume that energy. It makes it very difficult,” said Michael Cohen, head of energy markets research at Barclays.

The United States is the world’s largest exporter of fuels such as gasoline and diesel, and is poised to become one of the largest exporters of LNG by 2019. U.S. LNG exports were worth $3.3 billion in 2017. China is the world’s biggest crude oil importer.

China had curtailed its imports of U.S. LNG over the last two months, even before its formal inclusion in the list of potential tariffs. It had also become the largest buyer of U.S. crude oil outside of Canada, but Kpler, which tracks worldwide oil shipments, shows crude cargoes to China have also dropped off in recent months.

It comes at a time when the United States has several large-scale LNG export facilities under construction, and after Trump’s late 2017 trip to China that included executives from U.S. LNG companies.

China became the world’s second-biggest LNG importer in 2017, as it buys more gas in order to wean the country off dirty coal to reduce pollution.

"This will not affect the trade but will simply make gas more expensive to Chinese consumers," said Charif Souki, chairman of Tellurian Inc TELL.O, one of several companies seeking to build a new LNG export terminal.

China, which purchased almost 14 percent of all U.S. LNG shipped between February 2016 and May 2018, has taken delivery from just one vessel that left the United States in June and none so far in July, compared with 17 in the first five months of the year.

“The U.S. gas industry will be much harder hit by this as China imports only a small volume whereas U.S. suppliers see China as a major future market,” said Lin Boqiang, professor on energy studies at Xiamen University in China.

(For an interactive graphic on U.S. LNG shipments to China, see tmsnrt.rs/2n9bQKn)

Meanwhile, according to Kpler, crude exports to China dropped to an estimated 226,000 barrels per day (bpd) in July, after reaching a record 445,000 bpd in March. Sinopec, through its Unipec trading arm, is the largest buyer of U.S. crude.

China would likely hike purchases from Saudi Arabia, Russia, the United Arab Emirates and Iraq if the tariffs slowed U.S. flows, said Neil Atkinson, head of the oil industry and markets division at the International Energy Agency.

There will be “others who will be offering barrels to China, so it could find itself able to replace lost volumes from the U.S.,” Atkinson said.

With LNG demand expected to skyrocket over the next 12 to 18 months, there are still some two dozen firms seeking to build new LNG export terminals in the United States and tariffs may limit their ability to secure sufficient buyers to finance their proposed projects.

"Cheniere continues to see China as an important growth market and LNG as a ‘win-win’ between the United States and China," said Eben Burnham-Snyder, a spokesman at Cheniere Energy Inc LNG.A, which owns one of the two LNG export terminals currently operating in the United States. He added they do not see tariffs as productive.

One project being developed is in Alaska, which would carry natural gas through an 800-mile (1,287 km) pipeline across the state to a terminal that would convert it to LNG to take it to China.

The $43 billion project is still in development, and the Alaska Gasline Development Corp said on Friday that it believes the “current trade tensions between the United States and China will be resolved well in advance of Alaska LNG exports to China.”