Soviet deficiencies
下記の文章中のSoviet deficiencies はどういう意味ですか？
To some observers, it was, instead, a reaction to the increasing burden of Soviet deficiencies.
--補足--
【前後の文】
"The process of negotiations was an indication that people were realizing how important this [treaty] was," said Oliker. "And it was something that, both in the Soviet Union and the United States, people wanted. Everyone had realized that the arms race had gotten out of control."
To some observers, it was, instead, a reaction to the increasing burden of Soviet deficiencies. Former U.S. national security adviser Zbigniew Brzezinski.
"They had no alternative," said Brzezinski. "They increasingly realized that in a situation in which the United States and the Soviet Union were to compete in arming themselves, the advantage economically and technologically was increasingly with the United States."
【出展】VOA
http://www.voanews.com/english/news/europe/START-Treaty-Ushered-in-New-Nuclear-Era---135742513.html
