Ekaterina Krysanova (Russian: Екатерина Валерьевна Крысанова ) is a Russian principal dancer of Bolshoi Ballet.
Irek Mukhamedov OBE (born March 8, 1960 in Kazan, USSR), is a Soviet-born ballet dancer of Tatar origin who has danced with the Bolshoi Ballet & the Royal Ballet He trained at the Moscow Choreographic Institute under the guidance of Alexander Prokofiev between 1970 and 1978.
 Upon graduation he joined the Classical Ballet Company, where he spent three years touring around the world.
 It was with this company that he first danced Romeo, a role that was to become one of his most acclaimed.
 In 1981 he won the Grand Prix and Gold Medal at the International Ballet Competition in Moscow and was immediately invited to join the Bolshoi Ballet as a principal dancer, where he not only became Grigorovich's favourite danseur but went to become the youngest man ever to dance the leading role in "Spartacus".
 After leaving the Soviet Union, he became a Senior Principal Dancer with the Royal Ballet in London, remaining with the company for many years and dancing lead roles in the classic ballets as well as the English repertoire.
David Hallberg is American classical ballet dancer.
 He is a principal dancer for American Ballet Theatre and resident guest artist at the Australian Ballet, and formerly a principal dancer with the Bolshoi Ballet.
The Bolshoi Ballet is an internationally renowned classical ballet company, based at the Bolshoi Theatre in Moscow, Russian Federation.
 Founded in 1776, the Bolshoi is among the world's oldest ballet companies.
 It only achieved worldwide acclaim, however, in the early 20th century when Moscow became the capital of Soviet Russia.
 Along with the Mariinsky Ballet in Saint Petersburg, the Bolshoi is recognised as one of the foremost ballet companies in the world.
Roberto Bolle (Casale Monferrato, March 26, 1975) is an Italian danseur.
 He is currently a "principal dancer" with the American Ballet Theatre and a principal dancer "étoile" at La Scala Theatre Ballet.
 Bolle also dances regularly as a guest artist with the world’s leading companies, including The Royal Ballet, the Mariinsky Ballet, the Bolshoi Ballet and the Paris Opera Ballet.
Valentina Kozlova (born August 26, 1957) is a Soviet-born Russian American ballerina and founder of Valentina Kozlova International Ballet Competition.
 In 1979, while on tour as a young principal dancer with the Bolshoi Ballet, Kozlova defected to the United States, where she became a principal dancer with New York City Ballet and later, opened her own ballet school.
 Perhaps best known as a lyrical and expressive ballerina, Kozlova is also renowned as a private coach, producing students who have gone on to garner prestigious prizes and positions in companies such as Boston Ballet, American Ballet Theatre Washington Ballet, Stuttgarter Ballet, Les Ballets Trocadéro de Monte Carlo, Universal Ballet, and the National Ballet of Cuba.
Elza Leimane (born 2 July 1984) is a Latvian ballet dancer.
 She graduated from the Riga Choreography School in 2001 and has been a member of the Latvian National Ballet Company since her graduation.
 She has been a principal dancer with the company since 2004.
 Elza has had additional ballet training from the Paris Conservatoire (1999), Anaheim Ballet summer courses, USA (1999), International Batrolin Ballet seminar (2002 and 2003), Vienna Conservatory summer courses (2000), the St Petersburg Ballet Company, Maryinsky Theatre and Hamburg Ballet.
 She was a member of the European Youth Ballet in 2000, 2001 and 2004.
Ballet Manila is a classical ballet institution and dance company in the Philippines.
 It currently highlights more than fifty highly trained dancers in the highly rigorous Russian (Vaganova) method of classical ballet.
 Locally the company has performed in 47 cities holding more than 4,100 performances.
 The company has done tours in Asia, Europe and North America, where it has held more than 140 performances.
 The company is most notable for its in-house creative director, principal dancer and prima ballerina Lisa Macuja-Elizalde.
 Along with Ballet Philippines and the Philippine Ballet Theatre, Ballet Manila is one of the three major ballet companies in the Philippines.
 It regularly holds its performances at the Aliw theater and Star Theater, which are both located within Star City at Pasay City.
 The concept of a ballet company by the dancers, of the dancers and for the dancers was the idea of Lisa Macuja-Elizalde when she, along with ballet master Osias Barroso and ten other dancers established Ballet Manila in 1995.
Michele Wiles is an American ballet dancer.
 She was a principal dancer with American Ballet Theatre from 2005 - 2011.
 In 2011, she left ABT to form the independent classical ballet company Ballet Next with former New York City Ballet principal dancer Charles Askegard.
Spartacus (Russian: «Спартак», "Spartak" ) is a ballet by Aram Khachaturian (1903–1978).
 The work follows the exploits of Spartacus, the leader of the slave uprising against the Romans known as the Third Servile War, although the ballet's storyline takes considerable liberties with the historical record.
 Khachaturian composed Spartacus in 1954, and was awarded a Lenin Prize for the composition that same year.
 It was first staged, with choreography by Leonid Yakobson, in Leningrad 1956, but only with qualified success since Yakobson abandoned conventional "pointe" in his choreography.
 The ballet received its first staging at the Bolshoi Theatre, Moscow in 1958, choreographed by Igor Moiseyev; however it was the 1968 production, choreographed by Yury Grigorovich, which achieved the greatest acclaim for the ballet.
 It remains one of Khachaturian's best known works and is prominent within the repertoires of the Bolshoi Theatre and other ballet companies in Russia and the former Soviet Union.

Question: What is the nationality of the principal dancer for the ballet company located at the Bolshoi Theatre?
Answer: Russian