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As for which is easier, I can only say that Ukrainian is somewhat easier phonetically (at least, for speakers of English and most other European languages) because it contains fewer soft consonants than Russian, therefore the pronunciation is easier to master.
English

colloquialism is a word or phrase that is not formal or literary, typically one used in ordinary or familiar conversation
English

English grammar is fairly complex because it stems from two major language families that do not have the same structures. Modern-day English is influenced by Latin and Germanic/Saxon languages, and that is why we have so many conflicting grammar rules and a decent amount of complexity.
English

Real life means existing or occurring in reality : drawn from or drawing on actual events or situations real-life problems real-life drama.
English

Normally people answer with "All the best" or "Best regards". I'm really fond of the latter =).
English

Hey. Of course they can. But one should be aware of the stages of language acquisition. In my opinion, as soon as the child gets a gist of what language, regardless of what language, essentially is, they can start learning the second language. And that may be as early as five years old or so.