Nato’s top commander says alliance does not want war but is ‘ready to fight tonight’

Nato’s top military commander said the alliance is “ready to fight tonight” if it is attacked, as European officials warn Russia could test Nato’s defences with increased covert attacks or a limited military incursion.

European nations have in recent months faced an escalation of covert Russian activity, including an arson attack on an Estonian defence company and a failed attempt to attack a Ukrainian aircraft at a German airport.

If Russia decides to attack Nato, the alliance will respond by...