Russia's latest spyplane is broadcasting its flight home from Syria.
The Aviationist pointed out that the plane had its ADS-B transponder on, allowing it to be tracked on Flightradar24. The Tu-214R also broadcast its deployment to Syria on the 15th.
An older article on The Aviationist discusses the impact of ADS-B and MLAT tracking on military craft. Somewhat related is a recent Defense One article on using commercial satellite imagery to identify airstrip expansion.