The storyline with Big Show and the Russian flag, including the company’s apology, was all simply part of a planned angle. WWE does have television shows in Russia, so they may have wanted to soften the blow, however it’s said that the entire thing was all planned out in advance.
The incident actually made the news in some Russian outlets, although it wasn’t treated as a major story or anything like that.
The part of the angle where Big Show pulled down the Russian flag ended up being edited off WWE’s Russian version of RAW, as the show airs on a five-day delay.
On a somewhat related note, Rusev and Lana are apparently put over strong by the Russian announcers as national heroes and babyfaces.