British Foreign Secretary Liz Truss warned Russia on Wednesday it would be a "grave mistake".
Russia's defence minister accused US bombers of rehearsing a nuclear strike on Russia from two different directions.
Russia-West ties have been at post-Cold War lows for years.
Alexei Navalny was awarded the prize for his efforts to challenge President Vladimir Putin's grip on power.
The moves reflected a growing sense of urgency from the authorities as they confront fast-rising cases and widespread public reluctance to get injected.
The expected win by the ruling United Russia party is likely to be used by the Kremlin as proof of support for Vladimir Putin.
"After I saw the ad, I couldn't help myself."
The plane was thought to have crashed into a cliff as it was preparing to land in poor visibility conditions.
Makers of Russian "shampanskoye" may continue to use the term alone.