Interested in Decoded: the Phonetic Breakdown of 'но' and How Native Russian Sounds, here is a clear overview worth reading.

Every beginner in East Slavic languages encounters the contrast between hard (unpalatalized) and soft (palatalized) consonants. This binary division dictates Russian grammar, rhythm, and clarity.

Consonants paired with о remain hard. If the speaker accidentally introduces palatalization, raising the tongue body toward the hard palate, the syllable shifts toward нё [nʲo], altering the word's acoustic character completely.

Phonetic Parameter Russian "Но" English "No"
Consonant Point of Articulation Dental [n̪] (tongue touches upper teeth) Alveolar [n] (tongue touches gum ridge)
Consonant Quality Hard (Velarized/Neutral non-palatal) Neutral Alveolar
Vowel Trajectory Pure Monophthong [o] Diphthong [oʊ] / [əʊ]
Lip Configuration Static round protrusion Dynamic narrowing during glide
IPA Transcription [no] or [n̪o] [noʊ]

Maintaining a flat tongue body while anchoring the tip against the upper teeth preserves the required hardness of the н. This articulatory precision prevents confusing functional grammatical units in connected dialogue.