Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. NATO Boosts Black Sea Naval Presence Jamie Dettmer When it comes to the Black Sea, international attention has been focused for weeks on the opulent $1.37 billion mansion jailed Kremlin critic Alexei Navalny says is owned by Russian President Vladimir Putin. Tagged "Putin's Palace" by the Russian leader's foes, the 1,800-square-meter mansion is located on the Black Sea's northeastern shore near the Soviet-era resort town of Gelendzhik, once an outpost for 19th-century slave trading between the Caucasus and the Ottoman Empire. It is also a good spot to observe Black Sea naval maneuvers, of which in the past few days there have been plenty. The U.S. Navy, along with NATO partners, has dramatically increased a maritime presence in the Black Sea, part of a strategy to emphasize that Russian militarization of the waters between Europe and Asia since the 2014 annexation of Crimea will not go unchallenged. .