"We played very well, we wanted to win and get the result in the first half, (but) it was hard to play better than we played because the grass (on the pitch) was not very good".
Ronaldo has netted four times in as many appearances for Portugal over recent weeks.
Real Madrid superstar Cristiano Ronaldo opened the scoring from the penalty spot after 33 minutes at Saint Petersburg Stadium, while Bernardo Silva scored the second goal for the Iberian squad just five minutes later.
Andre Silva dribbled deep into the New Zealand penalty area to score with a rising shot in the 80th, and a substitute, Nani, shot low past goalkeeper Stefan Marinovic in stoppage time. "Overall though, it was a fair victory", said Portugal coach Fernando Santos.
It was his 75th goal for Portugal, bringing him level with Sandor Kocsis in second place on the list of Europe's highest global goal scorers.
"The team played their hearts out and I don't think anyone here tonight or in front of their television sets have any doubts about that".
Ronaldo could have added to his tally when he climbed to meet a Nelson Semedo delivery, his header scooped away by Stefanovic who then stood tall to superbly deny Andre Silva. "We know that in the semi-finals both Chile and Germany are great teams, but we are confident".
All White coach Anthony Hudson was pleased with the way his team had worked, and said there were plenty of positive to take from the game.
However, it was not all good news as Bernardo Silva went off injured at halftime, while a needless and reckless challenge from Pepe, with his side 2-0 up, earned the controversial central defender his second yellow card of the tournament, ruling him out of Wednesday's semi-final.
Some talented youngsters have also been important for Portugal recently, giving hope that the team can continue to succeed even after the most experienced players begin being replaced in the not-so-distant future.
KAZAN, Russia Russia coach Stanislav Cherchesov shrugged off his team's early exit from the Confederations Cup that they are hosting on Saturday, insisting they had made a "qualitative leap" over the past year.
He struggled on for the rest of the half but was taken off at half-time.
"Frankly, I didn't see the replay", Cherchesov said, when commenting on the benefit of the VAR system, which will also be used for the Federation Internationale de Football Association 2018 World Cup.
He will be primarily occupied, though, by the fact that his team are improving.