PREVIEW: Top Russian diplomat to meet with counterparts from Sahel Trio / Senior Russian diplomat briefs CIS, CSTO envoys on Moscow-Washington exchanges / Russian, US diplomats to meet in Istanbul on Feb 27 to discuss embassies' work -- Lavrov / Quite a lot of contacts between Russia, US now -- senior Russian diplomat / Moscow's cultural center in Chisinau continues its operations, says Russian diplomat / Russian diplomats face immense pressure, MFA spokeswoman says / Russian diplomats help keep planet from veering into chaos -- ambassador to Cyprus / Moscow to retaliate expulsion of Russian diplomat from London -- foreign ministry to TASS / Russian top diplomat discusses security framework in Eurasia with CIS ambassadors / Russian diplomats arrive in Syria to smooth ties