Ok, so in mid/late war, there were 3 major offensives on the Eastern front (1916 onwards)
1. German led (supported by Austrians, Ottomans and Bulgars) on Romanians - ended up in near blitzkrieg of Romania, with over 85% country occupied in very short time.
2. Brusilov offensive - ended in massive casualties on both sides but ultimately weakened Russia.
Lake Naroch and other offensives were on simultaneously on German side of the front and disastrously flopped.
3. German offensives and Kerensky offensive on Russo-German front in 1917, ended with disaster for Russia and major victory for Germany and treaty of Brest-Litovsk.
TLDR- except Brusilov offensive, Russia in RL didn't pull a single major offensive against CP after 1914, also Russia always struggled in offensives vs inferior numbers of Germans and collapsed whenever German armies attacked in strength (1915 under Mackensen or 1917 under Hoffman).
As for Austria, after 1914 no major successful offensive
As for Italy, no major successful offensive in the whole war.
Same for Ottomans and all minors. Ottomans had 2 major victories 1 in KUT and 1 in Gallipoli, both against the British Empire but in Defensive set-up only. Their major offensives on the Sinai and in Armenia both flopped badly, Russia did win some minor victories in Armenia but nothing threatening Anatolian heartland.
TLDR - Minors, Ottomans, Italy, Austria and Russia were substantially weaker to Germans and UK, French were also weaker than those two but stronger than all others.
This distinction is proved by battlefield records in offensive and defensive operations.