President Trump’s warming with Xi Jinping of China, a leader he admires, has ignited anxieties in Washington and across Asia.

President Trump said that he would talk to Taiwan’s president about a possible weapons sale to the self-governing democracy. Direct dialogue would anger China, which claims Taiwan as its territory and opposes contact between Taiwanese and foreign leaders.

Swiss law prohibits selling war materiel to countries involved in armed conflict, a policy the country has already cited to block sales to Israel and Iran.

A surge of weapons is flowing from the U.S. to Mexico. These firearms — sourced from gun shops, shows, websites and apps — are funneled across the border to fuel the country’s most violent crimes.

Ukraine wants to leverage its defense expertise into security partnerships and to reap potentially vast profits for its arms industry.