Actress Katherine Winick said she stood by her country, a day after US President Joe Biden warned there was a "different possibility" of Russia invading Ukraine next month.
White House National Security Council spokeswoman Emily Horn said President Biden said there was a clear possibility that Russia could invade Ukraine in February.
Vinnik, who played Lagertha in the hit TV series "Vikings", is a Canadian actress of Ukrainian descent.
Taking to Instagram, the actress shared her old picture from her recent trip to Ukraine and wrote, "I stand by my motherland, Ukraine."
The gathering of tens of thousands of Russian troops along Ukraine's borders in recent weeks has fueled fears of an invasion.
Russia denied that it was planning an attack.
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