Now I'm very well aware that in the early 1900s Russia was very much a total part of the European landscape and there wasn't "us=Europe" and "them=Russia" mentality that developed after communist takeover of Russia.
But my point is, with Russia being allowed to peacefully develope it would inevitably become the continent's largest industrial and economic and military power and would thus shatter any illusion of a balance of power, without the wars it's population would also reach at least 400 million by today.
So my question is, would other European countries inevitably embrace each other out of fear of this Russia and create a proto-EU, or would relations continue as before with Russia being fully part of European alliance systems and other things.
Someone will inevitably say it depends on how Russia develops internally so let's just say the Tsars accept the need for reform and take the necessary measures to take the country into the modern era. You can take the liberty to invent other timelines in which the Tsar is overthrown and a republic is instituted or a constitutional monarchy.
And let's dismiss outright the myth that the Russian Empire was somehow doomed to collapse and would've disintegrated without WW1 anyway.