Newer generation Russian jets dominate combat zone, says Ukrainian official.

Newer generation fighter jets, such as the Su-35, are giving Russia "increasing dominance" in the skies over the conflict zone in eastern Ukraine, according to a senior Ukrainian official. This is a potentially worrying shift for the United States and its allies because Russia’s inability to achieve total air superiority throughout the course of the war has been key to Ukrainian successes on the battlefield. The official added that more air defense systems from the United States and its allies is currently "priority No. 1" for Ukraine, as they do not have the capabilities to counter this threat. Discussions are ongoing between Ukraine and NATO countries about the supply of modern fighter aircraft.