Key facts
- Operation Vivaldi was launched in May 2026 by Ukraine's 3rd Army Corps.
- The operation aimed to strengthen defensive positions in the Lyman and Sviatohirsk sectors.
- It also sought to disrupt Russian plans to encircle Sloviansk and Kramatorsk.
In May 2026, Ukraine's 3rd Army Corps initiated a covert counteroffensive, now identified as Operation Vivaldi. The operation's objectives were to reinforce Ukraine's defensive lines in the Lyman and Sviatohirsk regions and to thwart Russian efforts to surround the critical Ukrainian cities of Sloviansk and Kramatorsk.