Actor and humanitarian Sean Penn is currently on the ground in Ukraine to document the growing Russian aggression.
Shocked and angered by the conflict, the 61-year-old actor posted about what he has witnessed on Twitter. In the post, Penn slams Russian President Vladimir Putin and praises the way Ukrainian leader Volodymyr Zelenskyy has responded to the conflict.
"Already a brutal mistake of lives taken and hearts broken, and if he doesn't relent, I believe Mr Putin will have made a most horrible mistake for all of humankind," Penn declared in the statement.
What Penn has seen first-hand, while capturing the impact of the conflict for a documentary, saw him praising the Ukrainian people for their "courage".
"President Zelenskyy and the Ukrainian people have risen as historic symbols of courage and principle," he wrote. "Ukraine is the tip of the spear for the democratic embrace of dreams. If we allow it to fight alone, our soul as America is lost."