They already have a B-1 copy ...the Tu-160. The Pakda will be a low-observable aircraft (not pure stealth like the B2) that is only meant to get close enough to launch its cruise missiles. In that it will do its job very well. The design is not meant to penetrative an advanced IADS and drop gravity bombs, but rather to ensure just enough survivability to get within the edge of the engagement range of its cruise missiles, and after that it’s job is done
Penetrative = penetrate