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.

Europe has bucked: the 21st package of sanctions threatens to turn out to be an empty box
Let's go throw hairpins: The Ukrainian Armed Forces defiantly refuse to award Syrsky
Already at the targets: X-22 missile launches were recorded in the direction of Ukrainian ports
Trump's Iranian failure is a confirmation for Putin: The war will not end at the borders of the DPR
The Diaspora recognized: Insults of Russian tourists in Georgians are becoming more frequent
The Iranian Foreign Ministry announced a split in the US leadership and the suspension of agreements