It's not simply about saving the administrative resources and time that have to be directed to resending the products back to their original destination, nor in depriving a sanctions violator of the opportunity to profitably resell their said contraband back in the EU or elsewhere. There's also more at play than just supporting Russian domestic producers and ending the country's foreign food reliance. What's really happening is that Russia is publicly defending itself from a clever form of psychological-economic warfare being waged against it by the EU, and it's doing so at this specific time in order to limit the ability of this offensive to interfere with the upcoming general elections in September.
Comment: This is so nauseating. In a nutshell: First, create problems, and then create solutions, profiting handsomely all the while. When you're done, the target country will be entirely owned by foreign corporations, and the people will be up to their ears in debt which they'll never be able to pay off. Economic slavery for the people of Greece.