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Foreign Ministry spokesman Martin Erdmann said top Bonn diplomat Wolfgang Ischinger had been assured by senior Russian officials that the ultimatum to storm and take the Chechen capital of Grozny was not valid .
 Foreign Ministry, Martin Erdmann, Bonn, Russian, Chechen, Grozny, Wolfgang Ischinger
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Foreign Ministry, Martin Erdmann, Bonn, Russian, Chechen, Grozny, Wolfgang Ischinger