Zacharka was among the creators of appeals to the League of Nations, Great Britain, France, USA and other countries by the Belarusian government.

[3] On 2 June 1920 Zacharka was appointed chief of the Belarusian diplomatic mission to Moscow where he held negotiations with the Russian foreign minister Georgy Chicherin.

Zacharka tried to convince the Soviets to recognize the independence of Belarus and to liberate Belarusian political prisoners held in Russian jails.

[1] After the Peace of Riga in 1921 the Belarusian government in exile passed resolutions criticizing it and supporting the Slutsk defence action.

On 20 April 1939 Zacharka sent together with Ivan Yermachenka a seventeen-page memorandum to Adolf Hitler personally asking him to take into account the interests of Belarus in any future developments.