What cultural faux pas should I try to avoid making in Kharkov?

"It is important to be mindful of cultural differences when visiting Kharkov. It is best to avoid making negative comments about the country or its people, as this can be seen as disrespectful. Additionally, it is important to dress modestly and to be aware of local customs and traditions. It is also important to be aware of the local language and to be respectful when speaking to locals. Finally, it is important to be aware of the local laws and regulations and to abide by them," mentioned another expat when asked about moving to Kharkov, Ukraine.