7807
The standoff between Russia and Ukraine over gas debts is critical but Moscow will fulfill its obligations for gas deliveries to Europe  Russian  energy giant  Gazprom  said Tuesday .
 country of headquarters: Russian, Gazprom
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 country of headquarters: Russian, Gazprom