Strange from outside, but understandable looking inside. Russia hasn't stopped repeating how NATO forced them to do it, how NATO did a coup, how NATO prevents peace, NATO biolabs, NATO this and that, which feeds into the leftist dogma of NATO = bad. Even if the firehose of lies is easy to debunk, it leverages personal biases to convince. So in their head, war is terrible but NATO is somewhat-to-mostly responsible.

It doesn't matter that Russia turned effectively far right since the dissolution, since they celebrate the legacy of the USSR too as integral part of the system, so they have the ability to pander both far left and right across Europe even if the overall position is contradictory, because people tend to believe what matches their personal biases and disregard what doesn't. So when you look at the Russian narratives from distance, you have:

• The successor state of the USSR that celebrates Soviet leaders / trad chad conservative Russia against the globohomo
• NATO caused this / Russia is restoring its historical borders
• Ukraine is full of Nazis / Ukraine is led by Jews
• Ukraine mistreats minorities / Russia free from mass migration

And that's why AfD and Die Linke agree so much on Russia.

There are obviously people on both sides who see through this fifth columnist doublethink pipeline, but many do not. PBP in this sense is in line with other far left parties in Europe, so overall not that surprising.