Depending on who you ask in Europe, China's colossal East-West infrastructure programme is either an opportunity or a threat -- and when French President Emmanuel Macron visits next week, Beijing will be watching to see how keen he is to jump on board.

Since China launched the New Silk Road plan in 2013, the hugely ambitious initiative to connect Asia and Europe by road, rail and sea has elicited both enormous interest and considerable anxiety.

"It's the most important issue in international relations for the years to come, and will be the most important point during Emmanuel Macron's visit," said Barthelemy Courmont, a China expert at French think-tank Iris.

The $1 trillion project is billed as a modern revival of the ancient Silk Road that once carried fabric, spices, and a wealth of other goods in both directions.

Known in China as "One Belt One Road", the plans would see gleaming new road and rail networks built through Central Asia and beyond, and new maritime routes stretching through the Indian Ocean and Red Sea.

Beijing would develop roads, ports and rail lines through 65 countries representing an estimate 60 percent of the world's population and a third of its economic output.

Macron, who heads to China for a three-day state visit on Sunday, will notably be accompanied by some 50 company chiefs keen to do business with the Asian powerhouse.

So far France has been cautious on the Silk Road plan, but Courmont said Chinese leaders were "waiting for a clear position" from Macron at a time when they view the young leader as an "engine" for growth in Europe.

"If Macron takes a decision on how to tackle the Chinese initiative, all of Europe will follow," Courmont predicted.

But, as Courmont acknowledges, Europe is divided on what to make of China's ambitions.

The continent could potentially benefit handsomely from increased trade over the coming decades, but in some corners there is suspicion that it masks an attempted Beijing influence grab.

"They are notably asking themselves about the geopolitical consequences of this project in the long-term," Alice Ekman, who covers China at the French Institute of International Relations, said of France and Germany.