Russia coach Dick Advocaat has told his side to be more clinical after they squandered a host of chances during an impressive 4-1 victory over the Czech Republic in their opening Group A game.
Two goals from Alan Dzagoev and further strikes from Roman Shirokov and substitute Roman Pavlyuchenko added gloss to the scoreline but Russia could have put the game to bed much earlier in the game.
Striker Aleksandr Kerzhakov was the main culprit, not hitting the target with any of his seven shots -- a European Championships first.
And Advocaat knows Russia will have to be more assertive in front of goal when they come up against the bigger teams.
"We are quite happy, we scored four goals and in any international game that is a very good result," he said. "We could have scored more goals, in fact we should have scored more as we had a lot of chances.
"At 2-1 we made it very difficult for ourselves so we have to get better at that because maybe a better team would have scored more against us.
"It could have been 2-2, there were moments where we need to be sharper, at certain points they had a lot of space and were very dangerous. But this was our first game and we are really happy with the result.''
Advocaat was particularly effusive about the performance of Andrey Arshavin, who looked a different player to the one that toiled at Arsenal for half a season before his loan move to Zenit.
"He worked very hard and he played very well," Advocaat added. "He is a very important player for us for the way we play and he was very, very good. I am very positive about him."
Czech coach Michal Bilek said his side would need to address plenty of issues before their second match against Greece on Tuesday.
He said: "I think we started well, in the first 15 minutes we had plenty of possession, but there were some attacking situations we did not finish off."Then we lost the ball in our opponents' half, they broke quickly and it was a mistake that cost us.
"We tried to change it after half-time and we scored a goal, but then we lost the ball again and the opponent punished us and that is why the result is what it is.
"We had problems with the combinations in Russia's midfield and that is how they had so many chances. We are very disappointed but now we have to show our strength and our team spirit.
"We are still able to win and the players have a chance to perform in the following two matches so we are going to look forward now.''