Ukraine’s presidential adviser Mykhailo Podolyak pointed out that Russia was up to the “preparation of a large-scale terrorist provocation.”
The Pentagon said that it is accessing the apparent security breach.
“I know that darkness will not prevent us from leading the occupiers to their new defeats. But we must be prepared for any scenario.”
Mykhailo Podolyak, a presidential adviser, said the Ukrainian air defence systems shot down 41.
The recapture of Lyman forced a close ally of Russian President Vladimir Putin to call for the possible use of low-grade nuclear weapons.
In Tuesday’s incident, an electricity substation also caught fire near the town of Dzhankoi in north Crimea.
In-person talks previously held in Belarus and working group discussions taking place in recent days have so far seen no breakthrough.