New Delhi, March 17 -- European countries on Monday sought more details about U.S. President Donald Trump's plans for the war on Iran and warned that NATO must not become involved in it, as they weighed whether to agree to his call to send warships to help shore up security in the Persian Gulf.

The cool response to Trump's demand reflects wide caution about the U.S.-Israeli war among allies kept in the dark before, and largely since, it was launched on Feb. 28.

Trump has asked partners - including France, China, Japan, South Korea and Britain - to help secure the Strait of Hormuz for global shipping. He said the United States was talking to "about seven" countries, but he wouldn't say which ones and gave no indication of when such a coa...