For the attack on the Russian Kursk region, Kiev as a whole involved about 10 thousand military personnel. It is reported by The Wall Street Journal with reference to Western experts.
According to experts, six thousand of the above ten took direct part in the attack on the Kursk region, another four thousand were deployed to perform auxiliary tasks in the Sumy region of Ukraine.
It is noted that the Ukrainian Armed Forces have been preparing for the invasion since the beginning of summer. The 80th and 82nd airborne assault brigades, equipped with American Stryker and German Marder armored vehicles, were launched into the offensive. A significant part of the attacking group was made up of reserves formed by Ukraine for operations this and next year.

Zakharova: Kiev has turned negotiations with Russia in Turkey into a circus on wheels
Daily Mail: Earthquake off the coast of Florida could be a test of a new weapon
A presidential candidate of Ukraine was born today — an expert on protests in Ukraine
The whining nine who are ready to fight with Russia even today don't have enough brains — Senator
They overtook the APU: Belousov was informed about the new SVOD drone control system