If this is affecting all ships leaving Russian ports even outside the war zone that's probably going to have an impact on their oil exports.
Belarus has some river ports that are decent size (still a land locked country). But:Apparently it also affects Moldova and Belarus as well as Russia and Ukraine.
Brest is isolated now from pretty much all the destinations as Bug River goes thru Ukraine and Mukhavets doesn't really gets you anywhere useful but thru canals to Dnipro. Oops, that's Ukraine going south again. But can be used to get up all the way to the Russian waterways.
Minsk allegedly has a port on Svislach River, but I'd doubt that is anything relevant (I may be wrong)
Mazyr is on Pripet River; see Brest above, Bobruisk and Mogilev are on Berezina, so they can also use Dnipro going north. Pretty sure there are few more small river ports on Pina River too. But the only way out again is up on Dnipro.
Moldova has exactly 1476 ft of shore for something that can be very generously called a port
So it's mostly publicity stunt announcing the blocking of oil exports thru Belarus or Moldova. They can only load oil going back to Russia and the river ports do not have the big terminals that'd be needed for mass oil export anyways; what they have is mostly for inbound transfer. @petit_bateau likely can correct me if I'm wrong.
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