Trump's EU tariff pressure?

Donald Trump reportedly asked the EU to slap tariffs of up to 100% on China and India, as part of a joint effort to make Russia stop its military operations in Ukraine. Using tariffs as a bargaining chip for foreign policy is nothing new for Washington, but this latest proposal, if true, leaves Europe in a precarious position, as China is the EU's second largest trading partner, and vice versa. If the EU bows to this pressure, what could this mean for the bloc's economy, not to mention its sovereignty? What's behind the latest push by the White House?