Also remember that Russia is not just an ordinary country you could do and undo upon when it comes to war and millitary power, they are fierce in this regards, even US and China dare not trespass them in this regards, they don't just have weapons they build it themselves.
Russia is not easy to look down really. Among the sanctions that they have got, the European countries and US have also allowed the oil and gas industry to continue and this means it is a selective sanction because they are being careful about the effect on other European countries , and this may not have the sanction to be effective. Russia is a world power after US and this is going to be a tough time for Europe sanctioning Russia.