EDS NOTE: GRAPHIC CONTENT - FILE -A Russian soldier lies dead as Chechen fighters gather next to a tank outside the presidential palace in central Grozny, in this Jan. 3, 1994 file photo as Russian troops and Chechen fighters battled for control of the breakaway capital. Two suspects in the Boston Marathon bombing have been identified to The Associated Press as coming from a Russian region near Chechnya In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia. (AP Photo/David Brauchli, File)