This is the best summary I could come up with:

Leaked documents last year confirmed that some NATO countries — including the United States, Britain and France — had deployed small numbers of special forces and military advisers to Ukraine in unspecified roles probably related to logistical support work and training.

The United States’ CIA has funded and partially equipped a sprawling network of spy bases across Ukraine that aid Kyiv’s efforts to track Russian troop movements and target the Kremlin’s prized military assets.

After Russia launched its full-scale invasion of Ukraine two years ago, thousands of sympathetic volunteers — largely from the West and post-Soviet states — enlisted under Kyiv’s banner.

Other volunteer brigades fighting for Ukraine include detachments of Belarusian fighters opposed to the Putin-backed dictatorship in Minsk, anti-Kremlin Russians and ethnically Turkic nationals from Russia, and post-Soviet states like Kazakhstan and Kyrgyzstan.

Infamously, soldiers from the Wagner organization, a state-backed mercenary company, participated in what was a short-lived putsch last June amid internal anger over the management of the war.

Their presence belies the constant state propaganda produced by the Kremlin, detailing accounts of Russian forces capturing or “eliminating” foreign mercenaries fighting for Ukraine in a bid to underscore the supposed illegitimacy of Kyiv’s government.

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