When visiting someone in Ukraine it is traditional to bring a gift with you, a bottle of wine, a dessert, a chocolate, or a bouquet of flowers would be a good choice, but a present that will remind them about your hometown would be considerably appreciated by your hosts.
If you bring flowers, make sure the number of flowers is uneven. Even numbers of flowers are for funerals.
If there are children in the house bring some small gifts for them.
When eating at someone’s house, dress casually unless otherwise specified.
Be prepared to accept all food and drink offered when visiting someone. Turning down food could be seen as rude. Usually food prepared at home is delicious.
Ukrainian do not wear shoes in their home, so be prepared to leave your footwear at the door when you enter a home, you will be offered a pair of home slippers, if not, it's normal to enter the room without shoes.
At the entrance hall of upscale restaurants and theatres, your bag, briefcase or coat could be checked for security reasons.
Shaking hands over a threshold of a door is considered really bad luck.
Take your gloves off your when shaking hands, never shake hands with gloves on.
Whistling is typically considered bad luck; some consider it will "blow your money away."
Men should offer one’s hand to a woman out of transport, pour her drinks, light her cigarettes, etc.
Do not forget to offer a woman’s coat upon leaving a theatre or restaurant.
Upon entering a Ukrainian church, men should not forget to take off their hats and women should wear scarves or hats. Don't wear shorts and a t-shirt.
On public transportation, give up your seat to mothers with children, the elderly, or the infirm.
Toasting is a very important in Ukraine, guests are usually asked to give a toast at dinner, be ready to say something nice about yours hosts.
Don’t clink glasses in a toast if you aren’t drinking alcohol.
Smoking is common in Ukraine; offer to share your cigarettes with those around you.
Don’t leave an empty bottle on a table. It’s considered bad luck.
People in Ukraine is very sincere, it is quite tolerable to ask very personal questions about your life, earnings, and relations.
For business situations, dress should be conservative.
Business meetings habitually begin with a friendly alcoholic drink, which would be considered rude to decline.
Don’t stand with your hands in your pockets.
Never confuse Ukrainians with Russians, Ukraine is an independent nation.
Ask permission before photographing someone.

Business Hours:

Ukrainian offices are generally open from 9 a.m. – 1 p.m. and from 2 p.m. – 6 p.m. A lunch break is taken between the hours of 1 p.m. and 2 p.m. Monday through Friday and closed Saturdays and Sundays. Although many offices remain open without breaks. Shops are frequently open between 10 a.m. and 7 p.m. weekdays and from 10 a.m. to 6 p.m. on Saturdays.

Tips:

Tipping used to be non-existent, now is fairly common, it will help you in getting a dining experience more pleasurable, you can expect to tip between 10 – 15 %. Sometimes it is automatically included in the bill; check your receipt to make sure that a service charge was included or not.