You see from Adrian's link above the difficulties Mac had going east then north of the RoB. If Swinarski can’t make progress there, no one can! They had to do a massive detour of the whole area to get to Anadyr.
666 MotoSyberia Czyste Zlo
Part of Colebatch’s 2009 plan was to get further east on a moto than anyone before. We knew that we could probably reach Merenga to claim this and possibly on to the sea coast. There were fish farms there (licenced and/or illegal) and they needed routes to get the fish out to markets. We also knew the CoastGuard/Police/Customs patrol this coast from the sea looking for illegal farms, so access to the sea was a probable route for the illegal trade.
However a few days before getting to the area we learned Swinarski and team had just done it, taking away our possible ‘first’ so we didn’t follow that target anymore. Talking to Greg, their ‘retiring’ member we met in Magadan, I felt quite relieved!
That is just getting east of the RoB. There is talk of soon extending the RoB Federal road system to Anadyr and also vague chatter of a possible tunnel to Alaska in the very long term. Such a road may help, but not for Kamchatka itself.
The Kamchatka peninsular has its own difficulties.
Firstly. The whole of Kamchatka was a closed military area. Closed to everyone, Russian or foreigners alike. The only people allowed to be there being military personnel posted there and their families plus a few indigenous people. This was relaxed a little with a permit application system and in more recent times the southern parts have had the restrictions removed, but I understand they are still in place further north. Added difficulties would be the natural protected area status.
Secondly. I looked briefly at the idea a while ago, but quickly gave up. Looking at contour maps of the ismuth I concluded it to be totally impassible (and I am not known for negativity as some will confirm).
At the narrowest point it is less than 90km across, from coast to coast. The mountains forming the ismuth are up to 2500m high with many rivers running down both sides, some depicted very wide.
With those dimensions of height and width I concluded it to be a very steep bit of land ruling out even zimnik winter roads. In summer, with that gradient, the rivers would be very fast flowing and therefore deep and rocky - and all going through big old volcanic rock formations
I gave up thinking about it as possible to reach by land. The only way to Kamchatka remains air and sea.
Of maybe foot?