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It's impossible to prove that no money from the KGB, or any other source, ever reached Greenpeace (and if it did it might have been without the knowledge of Greenpeace). However we can answer the specific question about the Rainbow Warrior's conversion

Rainbow Warrior (formerly 'Sir William Hardy) was acquired by Greenpeace in 1977 and refitted in London. (See also here and here)

It's impossible to prove that no money from the KGB, or any other source, ever reached Greenpeace (and if it did it might have been without the knowledge of Greenpeace). However we can answer the specific question about the Rainbow Warrior's conversion

Rainbow Warrior (formerly 'Sir William Hardy) was acquired by Greenpeace in 1977 and refitted in London. (See also here)

It's impossible to prove that no money from the KGB, or any other source, ever reached Greenpeace (and if it did it might have been without the knowledge of Greenpeace). However we can answer the specific question about the Rainbow Warrior's conversion

Rainbow Warrior (formerly 'Sir William Hardy) was acquired by Greenpeace in 1977 and refitted in London. (See also here and here)

1
source | link

It's impossible to prove that no money from the KGB, or any other source, ever reached Greenpeace (and if it did it might have been without the knowledge of Greenpeace). However we can answer the specific question about the Rainbow Warrior's conversion

Rainbow Warrior (formerly 'Sir William Hardy) was acquired by Greenpeace in 1977 and refitted in London. (See also here)