France has for months resisted pressure from Washington and other allies to scrap the 1.2 billion euro ($1.58 billion) contract and in September said it would only hand over the first carrier, the Vladivostok, if there was a lasting ceasefire and a political settlement in Ukraine.
With the situation worsening on the ground in Ukraine, France has again come under fire over the deal, while Moscow has tried to drive a wedge between Paris and its allies on the issue knowing that failure to deliver the carriers could damage France's image at a time when it is finalising other military contracts.
"Today, the conditions to deliver the Mistral aren't there," Valls told reporters. "France honours its contracts, but France is a nation that counts, wants peace in Ukraine and that makes sovereign decisions without anybody from outside dictating how it acts."
An unidentified Russian source quoted by state news agency RIA on Friday said if the Mistral was not delivered by the end of November Moscow would seek compensation.
The comments were published on the day a Russian delegation, including arms exporter Rosoboronexport, had originally been invited by the Mistral's manufacturer DCNS - 65 percent-owned by the French state - to travel to France for a ceremony to transfer the first ship.
"We are preparing for various scenarios. We will wait until the end of the month then we will announce some serious claims," the unidentified Russian source was quoted as saying.
Analysts were looking at various amounts of compensation, the source said, adding that the sum would not be kept secret.
French President Francois Hollande said at the end of October he would make a decision during November, but his defence minister, Jean-Yves Le Drian, told parliament on Wednesday DCNS had not been given the necessary government export licence.
"No date for delivery can be fixed at this stage," he told lawmakers. "A definitive decision will be taken when the time comes."
Europe and the United States have imposed numerous rounds of sanctions on Russia for its role in eastern Ukraine and EU foreign ministers will discuss further sanctions on Monday.
Hollande is due to meet Russian President Vladimir Putin on the sidelines of the G20 leaders summit in Australia this weekend.
"What's key - and the president will discuss it with several leaders during the G20 - is to rediscover the path to peace between Ukraine and Russia," Valls said. "We're far from that today."
