What started the Russo-Japanese War? Russia issued a preemptive strike on Japan in the Sea of China. The conflict over Korea escalated into war near Seoul, Korea. Japan launched a surprise attack on the city of Port Arthur in Russia. Negotiations to avoid war broke down, and war ensued.

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The main reason why the Russo-Japanese war started during the early start of the 20th century; it is regarded to be the first major conflict of the 20th century, was because Japan launched a surprise attack on the city of Port Arthur in Russia which was a direct provocation.

What brought about Russo-Japanese War is that Japan launched a surprise attack on the city of Port Arthur in Russia.

What caused Russo-Japanese War ?

Russo-Japanese War can be described as  territorial claims that was claimed by countries which is made on Manchuria .

The Russians wanted  ice-free port in the region so as to access to the Pacific Ocean.

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