Matsuev, singer Hibla Gerzmava and violinist Tatiana Samouil. These artists were joined by performers from the Bolshoi and Mariinsky theaters. Medals Sochi's medal design was unveiled in May 2013. The design is intended to resemble Sochi's landscape, with a semi-translucent section containing a "patchwork quilt" of diamonds representing mountains; the diamonds themselves contain designs that reflect Russia's regions. Those who won gold medals on 15 February received special medals with fragments of the Chelyabinsk meteor, marking the one-year anniversary of the event where pieces of the cosmic body fell into the Chebarkul Lake in the Ural Mountains in central Russia. Medal table The top ten listed NOCs by number of gold medals are listed below. The host nation, Russia, is highlighted. Podium sweeps Legkov and Vylegzhanin were initially disqualified by the IOC for doping offenses in November 2017, and their 2014 Olympic medals were stripped (gold and silver respectively). However, their results were restored on 1 February 2018 following a successful appeal. Calendar Security Measures Security during both the Olympics and Paralympics were handled by over 40,000 law enforcement officials, including police and the Russian Armed Forces. A presidential decree signed by President Vladimir Putin took effect on 7 January, requiring that any protests and demonstrations in Sochi and the surrounding area through 21 March (the end of the Paralympics) be approved by the Federal Security Service. For the duration of the decree, travel restrictions were also in effect in and around Sochi: "controlled" zones, dubbed the "ring of steel" by the media, covered the Coastal and Mountain clusters which encompass all of the Games' venues and infrastructure, including transport hubs such as railway stations. To enter controlled areas, visitors were required to pass through security checkpoints with X-ray machines, metal detectors and explosive material scanners. Several areas were designated as "forbidden", including Sochi National Park and the border with Abkhazia. An unmanned aerial vehicle squadron, along with S-400 and Pantsir-S1 air defense rockets were used to protect Olympic airspace. Four gunboats were also deployed on the Black Sea to protect the coastline. A number of security organizations and forces began stationing in and around Sochi in January 2014; Russia's Ministry of Emergency Situations (EMERCOM) was stationed in Sochi for the Games beginning on 7 January 2014. A group of 10,000 Internal Troops of the Ministry of Interior also provided security services during the Games. In mid-January, 1,500 Siberian Regional