"The RD-3 Skua is a modified Petrel that flies Signals Intelligence missions, analysing enemy signal emissions one the ground, including electronic, RADAR and cyber signals."@en . . . . "RD-3 Skua"@en . . . . . . "The RD-3 Skua is a modified Petrel that flies Signals Intelligence missions, analysing enemy signal emissions one the ground, including electronic, RADAR and cyber signals."@en .