Do countries that have nuclear weapons but have a small territory gain anything from having nuclear weapons?

In a debate, a former French minister questioned the usefulness of nuclear weapons for a country like France. He explained that in the event of a war against Russia, China or even the USA, for example, that in the event of a war against countries with huge territories, even if France had the capacity to retaliate, France would never be able to destroy one of these countries, because these countries have such huge territories that they would always survive a nuclear strike, whereas France would be destroyed.

So do you think that for countries like France and others of similar size or smaller, possessing nuclear weapons is useful?
Do countries that have nuclear weapons but have a small territory gain anything from having nuclear weapons?
Do countries that have nuclear weapons but have a small territory gain anything from having nuclear weapons?
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