Is Ukraine striking deeper behind Russia's lines?

STORY: EDITORS PLEASE NOTE: AN EARLIER VERSION OF THIS VIDEO REFERRED TO CRIMEA AS RUSSIAN TERRITORY. IT IS RUSSIAN-ANNEXED TERRITORY.

Footage of an electrical substation burning in Crimea may suggest that Ukraine's military has new abilities to strike deeper into Russian-annexed territory - a development that could potentially change the dynamic of the war.

Explosions hit a Russian ammunition depot near the site, which also prompted the evacuation of 2,000 civilians in a 5 kilometer radius, and disrupted rail lines.

Also on Tuesday: A Russian newspaper reported seeing smoke rising from a Russian airbase in Crimea.

There's no immediate claim of responsibility, although two members of the Ukrainian president's office hinted at the country's involvement on Twitter in what they called "demilitarization," a mocking reference to a word Russia uses to justify its invasion.

The war is approaching the end of its sixth month, but until last week the area appeared beyond the Ukrainian military's reach.

That was when explosions hit another Russian air base, destroying several planes.

Russia has blamed Tuesday's explosion on sabotage, a rare admission that forces loyal to the Ukrainian government have hit its supply lines.

Crimea, which was annexed by Moscow in 2014, is used by Russia to reinforce its troops fighting in other areas of the war.

Russian authorities reported few wounded and no deaths in Tuesday's incident.