The tsar was quick to agree to negotiate a peace treaty to end the russo-japanese war mainly because
1)russia feared that japan would totally crush its forces.
2)russia was running low on fighting resources.
3)russia was winning but was unsure that it could continue to win.
4)russia was fighting a strong military from afar.

The tsar was quick to agree to negotiate a peace treaty to end the Russo-Japanese War mainly because Russia feared that Japan would totally crush its forces.  

Option 1  

Explanation:

This war was a naval contradiction between Japan and the Russian empire from 1904-05. And, arose due to the competitive activity for the dominance of Korea and Manchuria. In the battle of Tsushima, Japan crushed the Russian Baltic fleet and naval powers.  

Losses also seemed to be heavy on both sides. So, the battle concluded with “Treaty of Portsmouth”. This was intermediated by Theodore Roosevelt, U.S President at Portsmouth, New Hampshire.