<meta @property="og:image"> contains the same image but with better resolution. Since 180x180 cover is unacceptable for IV, this one must be used (it's possible to check whether it has the same id).
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Also it seems the website uses "b" parameter for thumbnails, and "soc" for bigger images.
http://omskpress.ru/images/stories/uploading/b_0c356c4c1ca4464926b71c5599b30f91.jpg
http://omskpress.ru/images/stories/uploading/soc_0c356c4c1ca4464926b71c5599b30f91.jpg