James had another effort flash past the far post before an error at the opposite end of the pitch saw Leah Williamson bundle the ball into the path of Diana Silva in the box, but the forward blasted her shot wide.
The Lionesses struck in the 15th minute of the game when Bronze made a great touch to control a cross-field pass from James and the right-back launched a menacing cross into the centre of the area for Russo, who coolly tapped the ball past Ines Pereira.
A dangerous spell eventually reaped rewards for Portugal in the 75th minute when Barcelona forward Nazareth burst past Clinton and raced into box before smashing the ball into the top corner.
A triple substitution in the 59th minute saw Portugal spark into life and they applied more pressure, coming close when Diana Silva cut in from the right only for Mary Earps to make an easy save from the resulting shot.
A shift in momentum saw Portugal begin to threaten after the break and, following a spell of pressure, they earned an equaliser through substitute Kika Nazareth's stunning top corner finish.
