Russia on Tuesday dispatched one of six giant magnets needed for the ITER nuclear fusion programme in France, one of the last international scientific projects Moscow participates in despite the Ukraine conflict.
The ship carrying the Russian-made magnet -- or "poloidal field coil" -- departed Saint Petersburg on Tuesday under grey skies.
On board, the massive nine-metre-wide coil, which weighs 200 tonnes had been tightly wrapped to withstand a two-week trip to Marseille, southern France.
The ring-shaped magnet built under Russian atomic agency Rosatom's supervision will make up the top part of the world's largest "tokamak".
The tokamak is a magnetic fusion device built in France following the same principle that powers our sun and stars.
The Russian piece was meant to leave in May but sanctions forbidding Russian ships docking in Europe delayed the departure.
Geopolitical tensions "practically did not affect the realisation of this project", Perchukov said.
"Without (the Russian coil), the tokamak will not work," senior ITER centre scientist Leonid Khimchenko told AFP.
He hailed a "unique" achievement, over eight years in the making.
In southern France, 35 nations are collaborating to build the largest nuclear fusion device in the world.
"This is such an interesting project that in fact we are all one family... there is no competition between us, nothing," Khimchenko said.
The project was set in motion after a 1985 summit between US President Ronald Reagan and Russian leader Mikhail Gorbachev.
Andrey Mednikov, a scientist in charge of the production of the poloidal field coil, praised the continuing international cooperation.
"If this cooperation was brought to a halt," Mednikov said, "everyone would lose: both Russia and the international community."
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© Agence France-Presse
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