Short answers, pulled from the story.
The Ukrainian decommunization laws passed the Verkhovna Rada on the 9th of April 2015 with overwhelming support. President Petro Poroshenko signed them into law on the 15th of May 2015, and they took legal effect on the 21st of May 2015 after publication in Holos Ukrayiny.
Ukrainian historian Volodymyr Viatrovych and politician Yuri Shukhevych were instrumental in drafting the Ukrainian decommunization laws.
The Ukrainian decommunization laws outlaw the public display of Soviet communist symbols and propaganda, along with Nazi symbols and propaganda. They also restrict symbols of militarism and fascism, including the rising sun flag, and mandated the removal of communist-era monuments and the renaming of places tied to communism or the Soviet Union.
More than 51,493 settlements, streets, squares and buildings were renamed under the Ukrainian decommunization laws. By the end of 2016-51,493 streets and 987 cities and villages had been renamed, alongside 1,320 Lenin monuments and 1,069 monuments to other communist figures removed.
The Ukrainian decommunization laws have raised concerns about freedom of speech and about honoring organizations and individuals recognized as having taken part in the mass murder of Jews, Poles, and Communists during the Holocaust in Ukraine and massacres in Volhynia. Polish politician Tomasz Kalita and former Polish Prime Minister Leszek Miller both objected to the elevation of groups such as the Organization of Ukrainian Nationalists.
Yes. In May 2017-46 Ukrainian members of parliament, mainly from the Opposition Bloc faction, appealed to the Constitutional Court of Ukraine to have the laws declared unconstitutional, and on the 16th of July 2019 the court upheld the laws.