There has been nothing in the news or otherwise that the Russian Ambassador was at the convention. This sounds like a false rumor.
There is an American ambassador to Russia. The current ambassador is John Beyrle. Evidently no American can be a Russian ambassador to other countries.
Russian National Union was created in 1993.
Russian National Unity was created in 1990.
Russian National Orchestra was created in 1990.
The Russian Bear is considered the national animal for the Russian Federation.
Russian National Badminton Championships was created in 1992.
Russian National Autonomous Party was created in 1935.
Russian National Wealth Fund was created in 2008.
Russian National Socialist Party was created in 1999.
Vladimir Putin is a Russian national.
the Russian Plainthe Russian Plain
Anglo-Russian Convention Triple Entente