What is the SWIFT system, and what does it mean for Russia? CNBC's Will Koulouris explains. cnb.cx/3K0IKFm | CNBC International

In just 20 years, more than half of our swifts have vanished. We believe that the loss of nest sites in the roofs of buildings is at least partly responsible. We’d like to know where you’ve seen groups of screaming swifts or swift nest sites anywhere in the UK. Report your sightings here ➡️ bit.ly/RSPBSwiftMapper By using Swift Mapper, you’ll help locate breeding hotspots for swifts and protect their homes. | RSPB