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Affected were a Russian oil giant , a Danish shipping and energy conglomerate , and Ukrainian government ministries , which were brought to a standstill in a wave of ransom demands .
 ( ransom: ransom demands,  a Russian oil giant: victim, a Danish shipping and energy conglomerate: victim, Ukrainian government ministries: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: ransom demands,  a Russian oil giant: victim, a Danish shipping and energy conglomerate: victim, Ukrainian government ministries: victim) 