A local resident rides his motorcycle near portraits of Syrian President Bashar al-Asad, right, and Russian President Vladimir Putin in the town of Rastan, Syria, Wednesday, Aug. 15, 2018. The Russian Defense Ministry said it is coordinating efforts to help Syrian refugees return home and rebuild the country's infrastructure destroyed by the civil war. (AP Photo/Sergei Grits)

A supporter of Venezuela's President Nicolas Maduro holds up his picture during a rally in Caracas, Venezuela, Monday, Aug. 13, 2018. The United Socialist Party of Venezuela (PSUV) organized the rally to show support for the president following what the government called a failed assassination attempt with explosives-laden drones. (AP Photo/Ariana Cubillos)

FILE - In this Dec.13, 2017 file photo, president of Venezuelan parliament Julio Borges leaves after receiving the Sakharov Prize for Freedom of Thought, an award given to Venezuela's opposition, in Strasbourg, eastern France. On Tuesday, Aug. 7, 2018, Venezuelan President Nicolas Maduro implicated Borges, one of the country’s most prominent opposition leaders, in an alleged assassination attempt using drones. (AP Photo/Jean-Francois Badias, File)

Julio Borges, president of the Venezuelan parliament, arrives for a meeting with Ernesto Macias, president of Colombia's Senate, at the Congress in Bogota, Colombia, Wednesday, Aug. 8, 2018. Venezuelan President Nicolas Maduro implicated Borges, one of the country's most prominent opposition leaders, in an alleged assassination attempt using drones. (AP Photo/Fernando Vergara)

FILE - In this Dec.13, 2017 file photo, president of Venezuelan parliament Julio Borges leaves after receiving the Sakharov Prize for Freedom of Thought, an award given to Venezuela's opposition, in Strasbourg, eastern France. On Tuesday, Aug. 7, 2018, Venezuelan President Nicolas Maduro implicated Borges, one of the country’s most prominent opposition leaders, in an alleged assassination attempt using drones. (AP Photo/Jean-Francois Badias, File)

A supporter Venezuela's President Nicolas Maduro holds up an image of him outside Miraflores presidential palace during a rally in Caracas, Venezuela, Monday, Aug. 6, 2018. Investigators are hunting for assailants behind a failed attempt to assassinate Maduro with explosives-laden drones, according to the government. (AP Photo/Ariana Cubillos)

Signs of smoke cover the apartment complex where an allegedly armed drone crashed, causing a fire, in Caracas, Venezuela, Sunday, Aug. 5, 2018. Venezuelan President Nicolas Maduro dodged an apparent assassination attempt the previous day when drones armed with explosives detonated while he was delivering a speech to hundreds of soldiers being broadcast live on television, according to officials. (AP Photo/Ariana Cubillos)

Press members wait as they try to get access to an apartment complex where an allegedly armed drone crashed, causing a fire, in Caracas, Venezuela, Sunday, Aug. 5, 2018. Venezuelan President Nicolas Maduro dodged an apparent assassination attempt the previous day when drones armed with explosives detonated while he was delivering a speech to hundreds of soldiers being broadcast live on television, according to officials. (AP Photo/Ariana Cubillos)

In this photo provided by the Miraflores Presidential Palace, President Nicolas Maduro speaks during a event marking the 81st anniversary of the National Guard, in Caracas, Venezuela, Saturday, August 4, 2019. Venezuela's government says several explosions heard at a military event were an attempted attack on President Maduro. Information Minister Jorge Rodriguez said in a live broadcast that several drone-like devices with explosives detonated near the president. He said Maduro is safe and unharmed but that seven people were injured. (Miraflores Presidential Palace via AP)