The only reason we see Nato putting troops etc. in the Baltic states is to set the line clearly to Putin and Assure the states he can go no further...but you note Nato is not surrounding Ukraine's border to protect them....and all other states in the area not with Nato are crying to join....but cannot because they don't meet the Euros conditions nor can they.
Putin pretty much could take Ukraine if he wanted, but he's not going to go that far....he's not about ready to have a land war when he can get what he wants with Ukraine returning back to the neutral position, under Russia influence it previously was...and that is where it will head eventually.