
The Ukrainian counteroffensive out of Kharkiv city may disrupt Russian forces northeast of Kharkiv and will likely force Russian forces to decide whether to reinforce positions near Kharkiv or risk losing most or all of their positions within artillery range of the city.
Ukrainian Commander-in-Chief Valerii Zalyzhnyi stated on May 5 that Ukrainian forces are transitioning to counteroffensive operations around Kharkiv and Izyum, the first direct Ukrainian military statement of a shift to offensive operations.
Ukrainian forces did not make any confirmed advances in the last 24 hours but repelled Russian attempts to regain lost positions.

https://en.m.wikipedia.org/wiki/Occupation_of_Czechoslovakia_(1938%E2%80%931945)
Mind you the USA kept its snout out,but British intelligence fooled around inside CZ for a long time.

