European heavyweights England, world champions France, holders Portugal and Belgium all enjoyed winning starts to their UEFA Nations League campaigns on Saturday even if there were signs of international rust following the coronavirus shutdown.

England needed a stoppage-time penalty to beat Iceland 1-0 while France saw off Sweden by the same scoreline.

Portugal shrugged off the absence of Cristiano Ronaldo to thrash Croatia 4-1 with top-ranked Belgium coming away from Denmark with a 2-0 win.

In Reykjavik, Raheem Sterling's last minute penalty salvaged England from another embarrassing result against Iceland.

Gareth Southgate's men also survived going down to 10 men and seeing Birkir Bjarnason miss a late spot-kick for the hosts.

Four years on from one of English football's most embarrassing nights in losing 2-1 to Iceland at Euro 2016, England were far from the free-scoring force that romped through Euro 2020 qualifying in their first match for 10 months.

Harry Kane had an early goal wrongly ruled out for offside before Kyle Walker was sent-off for two bookable offences 20 minutes from time.

All of Iceland's good defensive work was undone in the 89th minute when Sverrir Ingason was also harshly dismissed for a second booking when he blocked Sterling's shot with his arm.

With Kane having been replaced by Mason Greenwood, Sterling took responsibility from spot, but the drama did not end there.

Straight from kick-off, Joe Gomez was adjudged to have bundled over Holmbert Fridjonsson inside the area, but Bjarnason blazed the resulting penalty over.

"The sending off is a key moment because it is very difficult to win games of football when you go down to 10 men. It was an unnecessary red card," said Southgate of Walker's dismissal.

"We leave here with the win but a bit flat because in the end it feels like we got away with it."

Kylian Mbappe scored with France's only shot on goal in Solna to give the world champions a 1-0 victory over Sweden.

Mbappe picked up the ball wide of the goal in the 41st minute, squeezed past two defenders, waited for goalkeeper Robin Olsen to go down and then clipped the ball just inside the post from the narrowest of angles.

"It was a committed match, not a great match," said France manager Didier Deschamps. "It was a good back-to-school game, considering the fitness levels."

In Porto, Cristiano Ronaldo was missing with an infected toe -- caused by a bee sting according to Italian media -- but Portugal were still too good for a disappointing Croatia.

Joao Cancelo, Diogo Jota, with his first international goal, Joao Felix and Andre Silva were all on target for Portugal who also hit the woodwork three times.

"It has been a long time since we all got together and some players came straight from their vacation, but the team responded well," said Felix.

Croatia were without Luca Modric and Ivan Rakitic who boast a total of 233 caps between them.

Bruno Petkovic grabbed a stoppage-time consolation for the visitors.

"This wasn't the Croatia I know. We let them do whatever they wanted. There was no aggression in our game -- it should have been 4-0 in the first half," said Croatia defender Dejan Lovren.

Belgium defeated Denmark 2-0 in Copenhagen, handing the Danes a first home loss in four years and an opening defeat for new coach Kasper Hjulmand.

Belgium, without the retired Vincent Kompany and Kevin de Bruyne, who was attending the birth of his third child, were in front after just nine minutes.

Lyon defender Jason Denayer tucked away his first international goal from Dries Mertens' free-kick.

Mertens added the second in the 77th minute when the Napoli striker pounced on a loose ball after Kasper Schmeichel had blocked a Youri Tielmans effort with his legs.

Results:

League A

Group 2

At Reykjavik

Iceland 0 England 1 (Sterling 90+2-pen)

At Copenhagen

Denmark 0 Belgium 2 (Denayer 9, Mertens 77)

Group 3

At Solna

Sweden 0 France 1 (Mbappe 41)

At Porto

Portugal 4 (Joao Cancelo 41, Diogo Jota 58, Joao Felix 70, Silva 90+5) Croatia 1 (Petkovic 90+1)

League C

Group 1

At Nicosia

Cyprus 0 Montenegro 2 (Jovetic 61, 74)

At Baku

Azerbaijan 1 (Sheydaev 43) Luxembourg 2 (Krivotsyuk 48-og Rodrigues 72-pen)

Group 2

At Skopje

North Macedonia 2 (Alioski 6-pen, Nestrovoski 39-pen) Armenia 1 (Barseghyan 90+5)

At Tallinn

Estonia 0 Georgia 1 (Katcharava 33)

League D

Group 2

At Gibraltar

Gibraltar 1 (Torrilla 42) San Marino 0

Played Friday:

League A

Group 1

At Florence

Italy 1 (Sensi 67) Bosnia & Herzegovina 1 (Dzeko 57)

At Amsterdam

Netherlands 1 (Bergwijn 62) Poland 0

League B

Group 1

At Bucharest

Romania 1 (Puscas 25) Northern Ireland 1 (Whyte 86)

At Oslo

Norway 1 (Haaland 67) Austria 2 (Gregoritsch 35, Sabitzer 55)

Group 2

At Glasgow

Scotland 1 (Christie 45+1-pen) Israel 1 (Zahavi 74)

At Bratislava

Slovakia 1 (Schranz 89) Czech Republic 3 (Coufal 49, Dockal 54-pen, Krmencik 87)

League C

Group 4

At Vilnius

Lithuania 0 Kazakhstan 2 (Zainutdinov 4 Kuat 87)

At Minsk

Belarus 0 Albania 2 (Cikalleshi 23, Bare 79)

Played Thursday

League A

Group 4

At Stuttgart

Germany 1 (Werner 51) Spain 1 (Gaya 90+6)

At Lviv

Ukraine 2 (Yarmolenko 14, Zinchenko 68) Switzerland 1 (Seferovic 41)

League B

Group 3

At Sivas

Turkey 0 Hungary 1 (Szoboszlai 80)

At Moscow

Russia 3 (Dzyuba 48-pen, 81, Karavaev 69) Serbia 1 (A. Mitrovic 78)

Group 4

At Sofia

Bulgaria 1 (Kraev 56) Rep. of Ireland 1 (Duffy 90+3)

At Helsinki

Finland 0 Wales 1 (Moore 80)

League C

Group 3

At Parma, Italy

Moldova 1 (Nicolaescu 20) Kosovo 1 (Kololli 71)

At Ljubljana

Slovenia 0 Greece 0

League D

Group 1

At Riga

Latvia 0 Andorra 0

At Torshavn

Faroe Islands 3 (K. Olsen 25, A. Olsen 87, Hendriksson 90) Malta 2 (Degabriele 37, Agius 73)