Indeed, due to the ruble's fall and other factors, many western players has seen their sales to Russia grow more slowly, or even fall, from 2014 to 2016. Simultaneously, Chinese players' sales (especially via marketplace AliExpress.ru) have grown extremely fast.
However, the Russian market is not reserved for the Chinese: there are big opportunities for Western players, too. People interested in branded items still buy them, and now that the ruble has stabilized, or even regained some value, the market is far from being dead.
Witnessing this, Shopotam, our B2C cross-border marketplace, has seen its sales grow noticeably in 2017 after two years of decrease.
Another example is iHerb, a US site selling natural products. Now Russia generates even more traffic (17.7%) than the USA, according to the freshest stats from Similarweb. And Russia stands second (15.7%) after Italy for Yoox, second (9.7%) after the USA for Farfetch, third (7%) after the UK and the US for ASOS.
Regarding ASOS, I believe that their Russia sales might be in the range of $100 million per year, if extrapolating from the data they have announced at a recent conference and from the traffic they generate from Russia.
In contrast with these players, Amazon's sales in Russia account for a small proportion of their total business.
Chinese e-commerce players are doing fine on their side, but we're talking about different product categories (e.g. electronics), different product classes, or different levels of quality in similar categories (e.g. clothing).