IMO the response of the Obama administration to the Russian assault on our democracy was anemic - However the statement that he "said nothing" about the hacking is false.
The Washington Post published an article last week titled "Obama's secret struggle to punish Putin's election assault" - It reads like a small book - Both Republicans and Democrats have cherry-picked this report for talking points - From MSN News:
http://www.msn.com/en-us/news/politics/obama’s-secret-struggle-to-punish-russia-for-putin’s-election-assault/ar-BBD4mdS?li=BBnbcA1
And what actions have the Trump administration taken to stop future election meddling? - According to this recent report from NBC News, little to nothing:
http://www.nbcnews.com/politics/elections/trump-white-house-has-taken-little-action-stop-next-election-n776116
As far as I can tell, Trump only gave full-tweeted unqualified recognition of the Russian meddling when he figured, through some perversion of logic, he could blame Obama for it.