Effective in August 2012, a law on regional languages did entitle any local language spoken by at least a 10% of the population to be declared official within that area. Within weeks, Russian was declared as a regional language in several southern and eastern oblasts and cities. From that point Russian could be used in those cities'/oblasts' administrative office work and documents. On 23 February 2014, the law on regional languages was abolished, making Ukrainian the sole state language at all levels even in Eastern Ukraine, but this vote was vetoed by acting President Oleksandr Turchynov on 2 March. A February 2015 survey found that eastern oblasts (61%) preferred "second official regional language" over (31%) "state language" status for Russian. The 2012 law on regional languages was repelled by the Constitutional Court of Ukraine on 28 February 2018 when it ruled the law unconstitutional.