Ukraine will try the head of the navy for treason, after he surrendered his headquarters in the Crimean port of Sevastopol.
Denis Berezovsky was shown on Russian television swearing allegiance to the pro-Russian regional leaders of Crimea.
Ukrainian border guards have reported a build-up of armoured vehicles on the Russian side of a narrow sea channel dividing Russia and the Ukrainian region of Crimea.
The build-up of Russian armour was near a ferry port on the Russian side of the Kerch Channel opposite the Ukrainian city of Kerch, a border guard spokesman said.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.