The Security Service of Ukraine (SBU) said it disrupted what it described as the "biggest network" of Russian spies operating within the country who were allegedly collecting intelligence on ally-donated F-16 fighter jets, among other military targets.

The Security Service of Ukraine (SBU) said it disrupted what it described as the “biggest network” of Russian spies operating within the country who were allegedly collecting intelligence on ally-donated F-16 fighter jets, among other military targets.