There were long lines at gas pumps, turning each fill-up into an ordeal. Flights to vacation destinations were canceled, delayed or rerouted. Online orders were disrupted as e-commerce hubs were set ablaze by buzzing drones.

In addition, the F.C.C. is weighing stiff restrictions on common drone technology such as thermal imaging and aerosol spraying.

Ukraine is using fiber-optic drones in to study Russian bunkers and also shape attacks, a soldier said.

China’s drones conquered America long ago. One Chinese firm alone, DJI Technology Company, holds 90% of the American commercial market. But in December the federal government banned DJI from importing new drones, citing spying concerns.

The US has imposed tariffs of up to 100% on imported drones and critical components, with reduced rates available for some allied suppliers.

Estonia and Latvia reported drone threats in their airspace overnight.

Drones are being deployed in an increasing number of school districts – part of a growing school security industry as parents and schools find new ways to protect students and staff from carnage.

The Navy and other services have explored the use of laser weapons, but the capabilities come with substantial power and cooling requirements.