In case anybody is curious of the 21, this is from a different article on the topic:
"To date, some 21 countries/partners have issued a statement of support," she added.
These were Australia, Canada, Czech Republic, Denmark, Germany, European Union, Finland, France, Hungary, Ireland, Italy, Japan, Netherlands, New Zealand, Poland, Romania, Republic of Korea, Spain, Sweden, the United Kingdom, and the United States.
I'm somewhat surprised Hungary went against someone they're currently trying to forge closer ties with.