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But the government's own actions do matter, and this could be a defining moment.

The pair traded lefts and rights in the early stages before Thainara secured the first takedown of the contest - a move which proved to be the defining moment.

But the defining moment of the year came at the Belgian Grand Prix.

In 1972, thousands of Californians came together in what was a defining moment in state history.

Europe was facing a "clear and present danger on a scale that none of us have seen in our adult lifetime", European Commission chief Ursula von der Leyen said, while European Council President António Costa said this was a "defining moment for Ukraine and European security".