Putin states nuclear war is unwinnable.

We believe that a nuclear war cannot be won and must never be fought, and we stand for equal and indivisible security for all members of the world community,” the Russian leader said

https://www.republicworld.com/world-news/russia-ukraine-crisis/russian-president-putin-warns-nuclear-war-must-never-be-fought-stresses-it-cant-be-won-articleshow.html#:~:text="We believe that a nuclear war cannot be,in the international security and strategic stability system.

Excerpt from said article.

Russian President Vladimir Putin has said that nuclear war cannot be won and no such war should be fought. Putin made the statement in a message to participants of the Tenth Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). He underscored that Russia stands for equal and indivisible security for all members of the world.

The Kremlin head stressed that all NPT-compliant countries should have the right to the peaceful use of atoms without requiring any additional preconditions. He expressed Russia's willingness to share its experience in nuclear energy with its partners. Putin made the remarks in a message at the opening of the Tenth Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons which will take place until 26 August.

Russia stresses that the use of atoms will replace the need of oil over the long term future.

Chinese leaders agree with Vladimir Putin addressing nuclear war is a paper tiger.

Chinese leaders think about nuclear weapons differently. They don’t believe they can be used to fight and win wars. They don’t believe nuclear threats can coerce foreign governments. They believe the only purpose nuclear weapons can serve is to relieve the fear of being attacked with nuclear weapons. Foreign nuclear threats can safely be ignored if the enemy knows China can retaliate. This is what Mao Zedong meant when he called nuclear weapons a “paper tiger.”

Source https://responsiblestatecraft.org/2020/07/09/china-is-unlikely-to-engage-in-a-nuclear-arms-race-with-the-us/#:~:text=The answer is because Chinese leaders think about,don’t believe nuclear threats can coerce foreign governments.

This is an excerpt of article

These beliefs are not derived from abstract theories about nuclear deterrence. They are a product of China’s own experience.

In 1950, some Chinese leaders feared the United States would bomb Beijing and Shanghai if they intervened in the Korean War. They warned Mao the atomic bombing of major Chinese cities could destroy their newly established government. Chinese troops sent to defend the border with Korea were scared of the atom bomb. Morale was low and defections were high.

Mao argued the dangers of letting North Korea fall were much greater than the risks of a U.S. nuclear attack. He told his colleagues the United States wouldn’t use atomic bombs to destroy Chinese cities because the political costs were too high. Mao convinced his troops the United States couldn’t use atomic bombs on the battlefield because they were so destructive they would kill the Americans too.

President Truman threatened to use nuclear weapons after Chinese troops crossed the border. He didn’t and Mao felt vindicated. But it was a terrifying experience that pushed Chinese leaders to develop their own nuclear weapons. A second round of U.S. nuclear threats during Taiwan Strait Crisis renewed their determination.

The Twain straight crisis ... Again not really ground breaking new ground for the last 70 years reason and China have disputed where sovereign territory lines cross....

The First Taiwan Strait Crisis broke out in August 1954 when the Nationalists placed thousands of troops on Taiwan-ruled Kinmen and Matsu, two small islands just a few miles from the mainland.