Yunus-Bek Yevkurov, the Kremlin-backed president of Ingushetia, is the fourth government official in the North Caucasus targeted this month.
In tribal areas, it provides an alternative to hard-line clerics with a medley of local news, talk shows, and music.
The Nabucco pipeline, scheduled to start construction in 2010, would ship gas from the Caspian region and the Middle East.
The death of Bulgarian writer Georgi Markov in 1978 raises questions about Europe's lingering ties to communism.
The Russian president hinted for the first time, however, that the balance of power shift in his favor if he becomes prime minister.