Ukraine shot down an IL-76 (big four engine airplane) near Belgorod. Il-76s are general purpose transports, used for both cargo and military passengers.
The shoot-down of the plane is not denied but the contents of the plane are in dispute.
Ukraine claims that the plane was transporting weapons, possibly from Iran. Russia claims it was transporting Ukrainian POWs for a prisoner exchange, as many as 80 of them.
Russia has published a list of the names of the POWs killed in the crash. A basic name check shows that a bunch of the names are of former POWs who were
exchanged a few weeks ago.
Ukrainians are doubtful, pointing out that in previous exchanges all soldiers were transported by train.
The Russians are going for a full court press with the killed POW thing, claiming that
Ukraine knew full well that the plane was full of POWs because Russia had informed them of it as part of the planning for the exchange. The pro-Russian social media world is pushing really hard on this, frothing at the mouth and eye-rolling and loud loud LOUD.
So I think this will dominate the news from Ukraine for at least a week or two. They are equating it to the downing of the Dutch airline (MH-17) in 2014.
(The odd part is that the plane was heading north away from Belogorad and Ukraine, deeper into Russia. Like it had already dropped off its cargo or passengers. My wildly uninformed peanut gallery 2 cents is that both claims are wrong, the plane was empty).