` ` We 're not afraid of violence or war , '' they said in Cuba . Actor Sean Penn said that Castro 's are also open to meeting . Some in Havana skeptical of change in U.S. policy .
`` We 're not preachers of violence or war , '' Castro writes in essay . Actor Sean Penn writes that Castro 's brother also open to meeting . Some in Havana skeptical of change in U.S. policy .