«МЫ ВАМ РАДЫ!»
That’s Russian for “We are glad to see you!” (i.e. “Welcome!”).
From Investing in Russia’s Steel Future: Archival Footage from MMK, part of the TVDATA archive. The clip is available to license; packages are on the pricing page, and a restored 4K version can be prepared on request (4K archival footage). Email footage@tvdata.tv with the clip and duration you need.