I compare Russian language and Ukrainian language, but today without WolframAlpha.
Number of speakersEdit
In Russia, as native language - 118,6 million (2010).
In the world, as native language - 161,7 million (2013).
In Russia, as a second language - 18,9 million people (2010).
In the world, as a second language - 110 million people (2009).
As a native language - 37 million.
Total - 43-47 million.
Countries or regions, which have Russian and Ukrainian as an official languageEdit
Countries: Russia, Belarus, Kazakhstan, Kyrgyzstan, Tajikistan.
Controversial countries: Abkhazia, South Osetia, Transnistria, DNR (Donetsk People's Republic), LPR (Luhansk People's Republic).
Regions: Moldova (Gagauzia), Romania (Tulcea County (Karakaliu commune, Slava Cerkeza commune, Sarikoy commune, Jurilovca commune, K. A. Rosetti commune, Krisan commune), Constanța county (Ginderest commune), Suceava county (Musenița commune)), Norway (Svalbard), Ukraine (Dnipropetrovsk Oblast, Donetsk Oblast, Zaporizhia Oblast, Luhansk Oblast, Mykolaiv Oblast, Odessa Oblast, Kharkiv Oblast, Kherson Oblast).
International organisations: UN (one of six languages), UNESCO, IAEA, WHO, ICAO, WIPO, ITU, WMO, FAO, IFAD, CIS, EEC, CSTO, SCO, ATS, OSCE, ISO, ICC (ICCt), GUAM, Union State.
Controversial countries: Transnistria, DNR (Donetsk People's Republic), LPR (Luhansk People's Republic).
Regions: Russia (Crimean Republic), Romania (Maramureș County (7 communes), Suceava County (3 communes), Timiș County (2 communes), Caraș-Severin County (2 communes)), USA (Illinois (Cook County)).
Difficulty (my opinion)Edit
As I think, for English speakers, Ukrainian pronounciation is more difficult, than Russian. Because Ukrainian has these letters: ї, щ. Ї is read like "yi", for example, word "їжа", which means "food", is read like "yizha". And щ is read like "shch". For example, word "що", which means "what", is read like "shcho". But, as for each other, Russian for Ukrainian speakers is more difficult, than Ukrainian for Russian speakers. I think so, because I have a friend from Kiev, who speaks Ukrainian. And he speaks with me Russian very, very bad.