incursion

Mr. Putin is testing NATO’s resolve with drones and jet incursions, and he will continue to escalate if he pays no price.

Diplomats say the alliance is looking to fine tune its rules of engagement for dealing with Russian incursions and iron out different approaches between member states.

Germany has been scrambling to deal with the drone incursions, and Interior Minister Alexander Dobrindt has suggested that spending on civil drone defences could run to hundreds of millions of euros.

It is also weighing how to confront incursions by unmanned vehicles when the culprit, and their intentions, can’t be determined.

Officials have previously discussed using various measures to protect U.S. infrastructure from Chinese incursion and further limit the ability of Chinese companies to invest in the U.S.