Lithuania: blushing as he kneels down holding up the ring and saying "you make really happy and I need you in my life, would you like to share a life with me?"
(Back off biach he's mine ~America)
((Calm the hell down Alfie))

Latvia: "you make me happy, I don't lie, I was wondering if you wanted to marry me?" His face is redder than Spain's tomatoes

Estonia: most formal thing ever, he asks at a fancy resteraunt and is in a tuxedo

Ukraine: in tears in case you say no, she gives you the ring as a birthday gift and asks you then

Belarus: you are proposing and she screams "GET THE F*** UP GIVE NE THE RING, IM PROPOSING TO YOU MOTHERF***ER"

Russia: asks in the middle of the sunflower feilds when he slips the ring in your pocket