The Russians have experienced significant problems with the development of two new nuclear submarines after a submarine-launched ballistic missile malfunctioned, according to reports.

A Bulava missile failed in the second minute of a test after it was fired from the Alexander Nevsky submarine, according to a report by RIA Novosti. The Russian navy has started an investigation into the mishap.

Russian Defense Minister Sergei Shoigu suspended further tests for the Alexander Nevsky and the Vladimir Monomakh to include five future missile tests.

The Russian Navy has experienced a string of problems with their SLBM tests from the two submarines. Eight of 20 tests launches have been deemed unsuccessful, according to RIA Novosti.

The testing delays will likely push back the plan to put the Alexander Nevsky into operation by Nov. 15.