Sept. 10 (UPI) -- U.S. President Donald Trump urged the European Union to indirectly pressure Moscow to halt its war on Ukraine by imposing tariffs as high as 100% on China and India, two of the main customers for Russian oil.

Trump made the call during a U.S.-EU meeting on Tuesday exploring ways to work together to ramp up the economic pain on Russia, according to sources familiar with the talks cited by the Financial Times, the BBC and CNBC.

"We're ready to go, ready to go right now, but we're only going to do this if our European partners step up with us," said a U.S. official.

"The president came on [the phone call] this morning and his view is that the obvious approach here is, let's all put on dramatic tariffs and keep the tariffs on until the Chinese agree to stop buying the [Russian] oil. There aren't that many other places that oil can go," the official said.

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