Tensions rise as Russian fighter jet collides with US drone over Black Sea.

The Pentagon has released a video showing a Russian fighter jet intercepting and colliding with a U.S. MQ-9 "Reaper" drone that crashed into the Black Sea on Tuesday. The U.S. has accused Russia of operating its warplane in an "unsafe and unprofessional" manner during the encounter near Ukraine's Russian-occupied Crimean Peninsula. Russia has said it will try to recover the wreckage of the drone, but the U.S. has taken mitigating measures to prevent the loss of any sensitive intelligence. The incident has raised tensions between the two countries, with Russia warning of "proportional" reactions to any further U.S. "provocations" in the region.