Ukraine will be forced to enact all EU regulation currently in existence and that will make it a lot easier for big incumbent EU countries to roll in and exploit them
*They will be forced to adopt the same disasterous privatised Thatcherite electricity/telecoms market that we're stuck with.
*They'll have to allow foreign fishing boats into their water
*All their old LADA's will have to come off the road and be replaced with shiny new EV's from Stellantis and VAG which ordinary Ukrainian folk will have to pay for
*The likes of Veolia/Sodexho will be given a free pass to swoop in
*Any Ukranian company making goods now will find it hard to send their goods into the EU as they probably don't comply with various onerous standards that have been carefully crafted over the years as a protectionist measure for EU megacorps.
*Prices of everything will shoot up through the roof for Ukranians, house prices (currently about 10,000e for a house) will skyrocket as Europeans flood in.
All in all the country will become a playground for big companies from France and Germany