If the nationwide strikes within Russia were a factor that forced Russia to admit defeat, then the series of revolutions caused by this bloody incident were the reason Russia had to ask for more support from the international community.
This so-called revolution was actually a long-term social unrest. After the end of the Russo-Japanese War, terror attacks, strikes, peasant resistance, riots, and uprisings continued to emerge in major regions of the Russian Empire, creating domestic woes that could lead to the demise of the empire amidst sufficient external problems.
This so-called revolution had no organization, no goals, and not even a single reason.
If insisting on a reason, it can be mainly attributed to decades of national turmoil and dissatisfaction of the Russian people with the Romanov Dynasty.
Of course, the lack of reform in Russia decades ago and the demand for liberation by some ethnic minorities are also one of the causes.