"We condemn the recent absurd and destabilizing decree of Russia in respect of Russian passports for residents of Donetsk and Lugansk," the Twitter mission said in a statement.
Earlier, US Special Representative for Ukraine Kurt Volker said that Russia's decision to simplify the process of obtaining citizenship for residents of self-proclaimed DNR and LNR is provocative.
On April 24, Russian leader Vladimir Putin signed a decree on the simplified acquisition of citizenship by residents of Donbass.