The Trump administration announced on Tuesday that it is sanctioning several foreign companies to target millions of dollars’ worth of “combat drones” being traded between Iran and Venezuela. The development marks Washington’s latest effort to curb Iranian military capabilities amid concern the regime is rebuilding its nuclear weapons program.

The CIA carried out a drone strike earlier this month on a port facility on the coast of Venezuela, sources familiar with the matter told CNN, marking the first known US attack on a target inside that country.