This story has been updated to correct the date of the Russian invasion of Ukraine. Two years ago, Oleksandr Tkachenko was in ...

On the same day, Tkachenko announced his recommendation to the botanical garden's management and the National Academy of Sciences to immediately terminate the investment agreement signed in 2018.

Two years ago, Oleksandr Tkachenko was in Ukraine, assisting field medics on the front lines of the war with Russia. In the year prior to that, he says, he lost his father in the war. Now ...