Never give a Russian woman an even number of flowers. Even numbers are for the dead. Always give odd numbers. When you order a dozen, or two dozen roses, for her, ask them to throw in an extra one for good luck.
Never give yellow flowers to a Russian woman. It signifies infidelity and may mean that your relationship will not last.
Never give a watch as a gift to a Russian woman. Time is running out on your relationship.
Never give a knife as a gift, or take a coin back for it in return so that the knife has been sold and not given. If given as a gift it will cut the relationship.