The attack caused widespread outrage and prompted calls for the Western alliance, which has been reluctant to send any weapons that may escalate the conflict beyond Ukraine, to step up its support.
In a separate interview, Mr Pistorius doubled down on his view that Germany’s Nato spending was too low.
“From my perspective the approach that is being taken for next year is too low in terms of what needs to be done and provided in the context of the change in the times and the threat situation,” he told Deutschlandfunk, a German radio station. “I’m sticking to this.”
Any money that is not invested in the German army now “could come back to haunt us” in future, he added.
Mr Pistorius had expressed frustration earlier this week that Germany, which is wrestling with a budget crisis because of government spending limits, has not pledged more funding for the Bundeswehr.
Mr Pistorius, a member of chancellor Olaf Scholz’s centre-Left Social Democratic Party, says he wants to see about £5 billion a year added to his £44 billion military budget.
Meanwhile, Nato officials said a new defence site in Poland dubbed Aegis Ashore, which can intercept ballistic missiles in the event of a Nato-Russia war, was now “mission ready”.