Podstakannik: a tea glass holder, the kind you can see in the photo below, so one could drink hot tea without burning one's hand holding the glass.
Pod-, "under", stakan, "glass". Plural: podstakanniki.
Bubliki are the round things you see in the photo; they are somewhat like pretzels but round a bit softer, and slightly sweet instead of salty. They can be dusted with poppy-seeds, as in the picture, or plain. They are traditionally served with tea, and may be broken in half and dipped in the tea.