I would say it was only half-considered Western during certain Times. E.g: during the Crimean War, the 1878 crisis with the Ottomans, but for the vast majority of the time Russia was just the Easternest part of the West. TBH, for the 'Western' countries, the 'West' was/is used as a way to describe the 'civilized world'. So yes, when the UK, France, Germany, Austria... Didn't consider useful for them to portray Russia as an enemy, they considered it as a 'Western' nation (frankly, it seems normal, Russia is Christian, even if not Catholic or Protestant, has Big greek/Byzantine influence, just like the 'West' who adopted Ancient Greek philosophy, and Byzance itself could be considered 'roman', the Roman Empire had also left very Big parts of its legal system to the 'West', so yes, Russia is very close to being 'Western' IMO).