After three years spent trying to deter Russia from destroying Ukraine, European Union leaders grappled on Monday with how to respond to a major ally who appears determined to start a trade war or even seize part of their territory.

Shares in Europe and Asia have fallen after US President Donald Trump announced tariffs on Canada, Mexico and China, and said tariffs on the EU would "definitely happen". The German and French stock markets were down about 2%, with shares in carmakers among the worst hit, while London's FTSE 100 dropped more 1%.

On Friday afternoon, around the same time a delegation of senior Canadian officials was preparing to meet with President Donald’s Trump’s border czar in a bid to stave off withering new tariffs, Trump himself essentially told them from afar: Don’t bother.

Gulf stock markets fell in line with global shares on Monday, as U.S. President Donald Trump's tariffs on Canada, Mexico and China sparked fears of an escalating trade war and its potential impact on global economic growth.

Cryptocurrency prices slid on Monday as the risk of a trade war spooked investors and caused a selloff across financial markets.

Tariffs on goods imported from the U.S.'s three largest trade partners could upend industries from autos to consumer goods to energy. Executives have been able to deflect question

By Daphne Psaledakis, David Lawder and Bart H. Meijer WASHINGTON/BRUSSELS (Reuters) - U.S. stocks opened on Monday at their lowest level since Donald Trump was sworn in two weeks ago, and other global financial markets slumped after the U.