Amid rising tensions between NATO and Russia, the two sides are building up forces in several key places, including the Black Sea. Crimea, which Russia seized from Ukraine two years ago, is on the Black Sea, and that's also where Russia recently stationed a new frigate, the Admiral Grigorovich, inviting journalists on board at the Russian base in Sevastopol. The Russians insist this is not part of a build up directed at NATO, yet both sides have been making moves that make the other wary.
