The G7 summit was until not so long ago a meeting of leaders in harmony, who took advantage of the meeting to agree on the lines of action.
On Friday, in view of the many differences within the group, host country France has rejected even sending out a joint final statement.
The summit of the Group of Seven more developed countries will open on Saturday in Biarritz, southwestern France.
It aims to help traditional democratic powers to address their differences and try to bring vision to the most urgent aspects.
Boris Johnson will debut at the summit as the United Kingdom’s prime minister, with the threat of a no-deal Brexit, the UK's exit from the European Union, just around the corner on 31 October.
France and Germany have made it clear that they will not accept changes in the agreement reached, especially if that means giving up the safeguard over Ireland.
But Johnson will have a powerful ally, United States president Donald Trump who is waiting for his turn to strengthen the economic relationship with the UK when it leaves the EU.
The unilateral withdrawal of the US from the nuclear agreement reached with Iran in 2015 has raised tension with its Western partners, who fight for Tehran to respect its commitments despite the return of US sanctions.
The discrepancies were so evident that the French president Emmanuel Macron received Iranian Foreign Minister Mohamed Yavad Zarif on Friday in Paris, the same against whom Washington announced sanctions that disabled him as an interlocutor on 31 July.
The G8 became the G7 in 2014, after the annexation of Crimea by Russia, thereby breaking one of the channels of dialogue with Russian President Vladimir Putin.
Now the group is divided on the relevance of reintegrating Russia into the forum.
Trump leads the supporters of its return, with Japan and France open to considering it, while the EU is emphatic in its refusal.
4. TRADE WAR
Trade tensions concern a large part of industrialized countries, such as Germany and Japan, which will fight in Biarritz for the US to mitigate its protectionist practices in an environment of progressive decline.
The bleak macroeconomic outlook in the US, which is on the point of a recession, will be used by the other democracies to pressure Trump on the need to loosen the pressure, especially with China.
5. AMAZON FIRE
The most pressing news always finds a way of gaining a foothold in the G7.
In this case, the images of the Amazon rainforest on fire will bring the climate crisis debate to life.
Host president Macron posted on Twitter: "Our house burns. Literally. The Amazon, the lungs of our planet that produces 20% of our oxygen, is burning. It's an international crisis. Members of the G7, see you in two days to talk about this urgency."
One of the great objectives that France has set for the summit is to agree on a global rate for large digital companies for their income outside their countries of origin.
Paris has already approved the launch of a tax on giants such as Google or Facebook unilaterally, which sparked Trump's anger and he has threatened to impose reprisals on French wine.
The priority chartered by France for the G7 of Biarritz is the "fight against inequalities" and the fight for gender equality stands out prominently.
An advisory council which included Nobel Peace Prize winners Iraqi Nadia Murad and Congolese Denis Mukwege, will present a report that identifies good legislative practices that must be respected by countries that want to adhere to the so-called Partnership of Biarritz. EFE-EPA