Why is Russia called a "fighting nation"?

Because people in Russia really have no class, everyone feels particularly brave. Moreover, some traffic aspects in Russia will make people feel a little ridiculous. For example, I traveled to Russia some time ago and made an aerial image of Russia. Generally, if it rains or the weather is bad, I will choose to cancel the flight, but the flight in Russia will never be cancelled. No matter how bad the weather is, they will go straight to their destination. This is why so many people say that they are a fighting nation.