Do Air China and Vladivostok Air have interline agreement? Do I need a visa from T3 to T2 in Beijing airport?

Hello!

I am flying with Air China from Rome to Beijin, then from Beijin to Khabarovsk, Russia, with Vladivostok Air (within 24 hours, not leaving PEK).

I have several questions re this trip:

1) Do Air China and Vladivostok Air have interline agreement, and would I need to collect my luggage, go through customs and have a visa? (both flight are on the same itinerary as connecting flights – the stop in Beijin is to change flights only)

2) Do I need a visa to change from T3 (where Air China arrives) to T2 (where Vladivostok Air leaves from)? Is there a link between T3 and T2 that I can transfer through without going through customs and coming outside the airport). How do I find it?

Thank you very much in advance!