North Caucasus is the poorest, most violent and troublesome and less integrated and "russified" region in the Russian Federation. I am talking about the Muslim republics of Chechnya, Dagestan, Ingushetia and Kabardino-Balkaria. The Muslim North Caucasus has been a part of Russia for two centuries but Russia has failed to fully integrate them into a Russian state. In fact the situation has gotten worse since the fall of the Soviet Union. Russia fought two brutal wars in Chechnya with great cost for the country. The region is not in a state of war but a constant threat of terrorism and militant insurgency exists. The region produces very little economically but drains Russia's resources to maintain order. Billions of dollars have been used to rebuild Chechnya, but while Chechnya has been more calm lately the insurgency has spread to Dagestan and Ingushetia. The biggest problem for Russia in my opinion is that a big portion of North Caucasus population do not feel "Russian" and are not loyal to the country. The support of Caucasus nationalists and islamic extremists is wide spread among the population. These are not some fringe elements but popular movements and ideas especially among the younger people. Another problem for Russia is the internal immigration from North Caucasus to Slavic Russia. When these people immigrate they bring their problems and attitudes with them. We see more and more Caucasus Muslims in traditionally Slavic Russian cities like Rostov-on-Don and Krasnodar. There are also hundreds of thousands of them in Moscow. Have the recent developments shown that the Caucasus Muslims are an alien and hostile element in the Russian Federation that can never be "russified" like Tatars were before? Will they always be the "soft underbelly" and an ever growing problem in Russia (as their demographics are better than the demographics of the Slavic Russians)? Should Russia consider kicking these republics out of the Federation or should they be kept in at all cost?