Short answer, yes. Though it had only been officially extinct for a few years before they gave birth to a clone. It also doesn't seem to have lasted all that long before dying.Then again this was 10 years ago so the tech has likely come a long way since then.Have they been able to bring back an animal thats been recently extinct?
Finally, someone who knows something about Russian tanks.Mammoth are ridiculously tall. Russian tank designs all have a some things common : very low profile (for a smaller target), thick armor (since the plates are smaller, they can get them to be thicker, the glacis on a t72 is 8" thick) and large main gun (cuze fuck yeah). All those would be either impossible or difficult to implement on a mammoth centered design.
In mountainous terrain they could have potential I guess. Although I have the feeling mammoths arent the best of climbers.
WAR MASTODON (E)
The reappearance of this creature is due to an Ice Age/Nuclear Winter similarity. It's an elephant with a severe bikini line problem and an automatic gun on its back for anyone who makes that joke.