Give some stream of consciousness and then the answer. War and Peace (pre-reform Russian: Война́ и миръ; post-reform Russian: Война́ и мир, translit. Voyná i mir ( vɐjˈna i ˈmjir) ) is a novel by the Russian author Leo Tolstoy, which is regarded as a central work of world literature and one of Tolstoy's finest literary achievements.

Based on this passage, who wrote the classic novel war and peace?
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The relevant sentence in the passage is: War and Peace (pre-reform Russian: Война́ и миръ; post-reform Russian: Война́ и мир, translit. Voyná i mir ( vɐjˈna i ˈmjir) ) is a novel by the Russian author Leo Tolstoy, which is regarded as a central work of world literature and one of Tolstoy's finest literary achievements.
Therefore, the answer is Leo Tolstoy.
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