In the latest escalation of the decadeslong U.S. pressure campaign against Cuba’s communist government, the Trump administration is expected to unseal an indictment against Raúl Castro, the 94-year-old former president of Cuba, later today. The charges stem from the 1996 shootdown of four pilots with Brothers to the Rescue, the U.S.-based anti-Castro organization formed by Cuban exiles and dissidents. Peter Kornbluh, a Cuba specialist at the National Security Archive, says that the indictment will send “a clear warning” to Cuban leaders and provide justification for a possible future attempt to capture or assassinate Castro. “Military options are on the table and coming soon,” says Kornbluh. “It is absolutely clear that the U.S. military is preparing contingency operations in case Trump’s impatience runs out because Cuba has not met his imperial demands fast enough.”