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

"It is important to be aware of cultural differences when visiting Ukraine. It is important to be respectful of local customs and traditions. It is important to dress modestly and to avoid public displays of affection. It is important to be aware of the local language and to be respectful when speaking to locals. It is important to be aware of the local customs regarding gift-giving and to avoid giving gifts that are too expensive or extravagant. It is important to be aware of the local customs regarding alcohol consumption and to avoid drinking to excess. It is important to be aware of the local customs regarding religious beliefs and to avoid making any comments that could be seen as offensive or disrespectful," remarked another expat in Ukraine.