World Cup 2018: Who can qualify for the Round of 16?

President Donald Trump tweeted Sunday to congratulate the winning team, President Vladimir Putin, and Russia after the World Cup final, which he called "one of the best ever!"

"Congratulations to France, who played extraordinary soccer, on winning the 2018 World Cup. Additionally, congratulations to President Putin and Russia for putting on a truly great World Cup Tournament one of the best ever!," he wrote on his Twitter account on Sunday.

Earlier in the day, the national team of France defeated Croatia 4-2 in the 2018 FIFA World Cup final match in Moscow to snatch its second World Cup Trophy.

Croatia captain Luka Modric says determination and self-belief were always more important than physical stature in football and that will be as true in Sunday's World Cup final as in any other match.

At 1.72 metres (5ft 8in) and 66kg (146 lbs), the Croatia playmaker can cut a diminutive figure on the pitch but he has few rivals when it comes to skill, game-management and stamina.

On Sunday, the winner of four Champions League titles with Real Madrid will play the biggest match of his life against France and size will be the last thing on his mind.

"I've always ignored such talk," he told reporters on the eve of his nation's first World Cup final.

"I have never doubted myself even if others did, I always believed I could get to where I am today and thank God this came true.

"You don't have to be a giant to play football, I'm happy with where I am. I am happy with where I am and I never cared what anyone else said, it only further motivated me."

France will be clear favourites to win a second World Cup at the Luzhniki Stadium and Croatia will be relying on the resilience that got them through three lots of extra time and two penalty shootouts in their knockout matches.

Many of this generation of Croatian players grew up during the war following the break-up of Yugoslavia, however, and that have given them a mental toughness.

"I’ve seen a great deal of hardship in my life," added Modric, who lived in refugee hostels for several years as a child.

"The most important thing is to never give up, never give in to circumstances, believe yourself and to soldier on no matter what's in your way.

"There are ups and downs but whatever happens, you have to trust and believe in yourself.

"Fight for your dreams and success. This is what has always guided me."

Despite all the talent in their ranks, Croatia's place at the World Cup was in jeopardy as late as last October when Zlatko Dalic took over and Modric paid tribute to the impact the coach has had on the team.

"We are in the World Cup final, that was the influence of the coach," the 32-year-old said.

"He came into the picture at a very difficult moment ... In the first game, he talked us up to give us self-belief and told us we were still good players despite this crisis.

"He brought us calmness, he perked us up and what we most like is his sincerity and his attitude towards each and every player. We like having him around, he's shown his influence, not just as a coach but more importantly as a human being."

France managed to overcome mistakes and imperfections in their World Cup final victory over Croatia with sheer mental strength to lift the trophy for the second time, coach Didier Deschamps said on Sunday.

France overpowered Croatia 4-2 to lift the trophy and Deschamps became only the third man, after Brazil's Mario Zagallo and German Franz Beckenbauer to win it both as player and coach.

But they were made to sweat for about an hour and needed an own goal and a penalty to take the lead.

"My greatest source of pride is they had the right state of mind," Deschamps, who had captained France to the 1998 title, told reporters.

"Today there were imperfections, we did not do everything right but we had those mental and psychological qualities which were decisive for this World Cup."

France took the lead from a Mario Mandzukic own goal and they had to soak up a sustained Croatian offensive, including a 28th-minute equaliser, before going in front with a penalty.

They then struck twice midway through the second half to put the game beyond the Croats.

Deschamps said 14 of his players were World Cup newcomers but were ready to work towards a common goal and were mentally more mature than their age.

"Talent is not sufficient. You need the psychological and mental aspects. Any team is then able to climb mountains," Deschamps said.

"Sometimes I can be hard very hard with them but I do it for them and even though they are young they usually do listen."

Among the newcomers are Kylian Mbappe who was voted young player of the tournament and scored France's fourth goal.

"The collective is always important but there are individual players who have made the difference," he said, naming Mbappe and man-of-the-match Antoine Griezmann.

"Those 23 players will now be linked forever whatever happens. They will go different paths but will forever be linked together and from today nothing will be the same professionally because they are world champions.

"We will realise what has happened tomorrow," he said after his players stormed the news conference twice to douse him with champagne. "At the moment they do not know what it is to be world champions."

The 49-year-old coach, who also led France to the Euro 2016 final only to lose in Paris to Portugal, said that defeat may have been key to winning the World Cup.

"Maybe if we were Euro champions we would not have been world champions today. I learned a lot from that defeat," he said.

"The Euro final was different. We tried to stay relaxed this time and the players knew what they had to do and what was at stake."

Didier Deschamps proclaimed France’s second World Cup triumph was “just as beautiful” as their first after leading them to glory again 20 years on, but Croatia defender Dejan Lovren said that Deschamps' team "did not play football."

"I'm disappointed because we lost the game, we played much, much better football than them, but on the other hand I'm proud of this team and what we have achieved," Lovren said.

"We played beautiful football again. France were one of the favourites to win the World Cup and they did it. I think we were better. They did it another way. They didn't play football, they waited for their chances and they scored. They had their own tactic and you need to respect that. They played the tournament like that, every game, but when you look at all the countries behind us, we're second.” he added.

"There's nothing to talk about now. It's difficult to describe. Maybe after a week or two, a couple of months... right now, it's difficult. Some moments I feel sad, some moments I'm happy. Overall, I'm proud."

Ivan Perisic conceded the first-half penalty after referee Nestor Pitana penalised him for handball following a VAR review.

"I was sure he would not give the pen," said the Liverpool centre-back. "From my point of view, he [Perisic] could not react.

"It was a critical moment, we came back at 1-1, and then this penalty and then 3-1, 4-1, but even then we didn't stop playing football, we still believed, we gave everything, and this is why people are proud now in Croatia."

Didier Deschamps' side had claimed a 1-0 over Belgium in the semifinals with a defensive masterclass which left Belgium star Eden Hazard and Thibaut Courtois deeply unimpressed with what he felt were overly cagey tactics by France in the semi-final, and now Lovren also felt the frustration of coming up against Deschamps's style. Not always the most entertaining, however, in the end, French squad just had too much talent at its disposal to get the job done.

Croatian media on Monday hailed their team as heroes after the small country's historic success in reaching the World Cup final where France beat them 4-2.

"Thank you, heroes! - You gave us everything!" read the Sportske Novosti frontpage.

"'Vatreni' (the "Fiery Ones" in Croatian), you are the biggest, you are our pride, your names will remain written in gold forever!" the newspaper said.

It showed a photo of captain Luka Modric who was awarded the Golden Ball for the best player at the tournament, holding a trophy, although with a sad face after the defeat.

"Brave hearts - You made us proud," said Jutarnji List daily.

"Croatia celebrates you, you are our gold!" echoed the Vecernji List.

It noted that for the past month coach Zlatko Dalic's team "made Croatia better".

"They restored pride, pulled it out of the pessimism" reigning in the country whose economy remains among the weakest in the European Union.

More than 100,000 red-and-white-painted Croatian fans were expected to welcome the squad home later Monday in the capital Zagreb.