Ongoing updates on Russia's conflict in Ukraine.

Russian forces continue to launch heavy attacks on Ukrainian towns and positions in the eastern part of the country, with the area between Lyman and Kupyansk under the heaviest fire. Ukrainian paratroopers shot down a Russian Su-35 aircraft over the nearby town of Chervonopopivka. Meanwhile, Ukrainian special forces training on US-made Black Hawk helicopters have shown immediate promise, with pilots impressed with the aircraft's reliability, ease of operation, and combat survivability. Two teenagers were killed by Russian attacks on a town in Ukraine's southern Mykolaiv region early Sunday.