France has decided to stop delivering to Russia the first of two Mistral assault ships due to the Ukrainian crisis.
President Francois Hollande’s office has blamed Moscow’s recent actions in Ukraine.
So far, France has resisted pressure to stop supplies.
He said the conditions were “not suitable” for delivery, as it was necessary to fulfill an existing contract to which EU sanctions could not be applied back, and to cancel it would be too costly.
Vladivostok, the first of the two helicopter carriers, was expected to be delivered to Russia by the end of October.
The second, Sevastopol, was to be sent the following year, although Francois Hollande’s statement did not say so.
The office of Francois Hollande said that today’s statements by the presidents of Russia and Ukraine about a possible ceasefire are not enough to allow France to give it its approval.
“The President of the Republic has concluded that, despite the prospect of a ceasefire, which has yet to be confirmed and put into effect, the conditions under which France may allow the supply of the first helicopter carrier have not been created,” the statement said.
Earlier on Wednesday, Ukrainian President Petro Poroshenko said he had agreed on a “ceasefire process” with his Russian counterpart, Vladimir Putin.
Vladimir Putin expressed hope that a peace deal could be reached by Friday, when representatives of Russia, Ukraine and the rebels will meet in Minsk for talks.
Pro-Russian insurgents have said they support Vladimir Putin’s proposals but do not trust Petro Poroshenko to support a ceasefire.
It is unclear whether there is any truce on the ground.
In Estonia, meanwhile, President Barack Obama has sought to reassure the Baltic states that they will be protected by NATO, and has said Washington will support Ukraine.