File:Venn diagram gr la ru.svg

Venn diagram of Greek, Latin and Russian Cyrillic upper case graphemes

The intersections with the Latin alphabet are used for Greek and Russian licence plates:
Licence plates in Greece use the letters Α, Β, Ε, Ζ, Η, Ι, Κ, Μ, Ν, Ο, Ρ, Τ, Υ, Χ.
Licence plates in Russia use the letters А, В, Е, К, М, Н, О, Р, С, Т, У, Х.

Inclusive versus exclusive

This diagram uses the typeface Ubuntu. The forms of Л, Д У and Y this typeface actually uses can be seen in the two files below.

Y / У

They are different in most printed text, but can be represented in the same way. In handwritten blockletters they usually look the same.
Cyrillic У is in the Russian licence plates, because in countries that do not use the Cyrillic alphabet it will be read as Y.
Cyrillic У always has two strokes, and often a rounded bottom end. Y is usually symmetric when printed.

Asymmetric Latin Y: serif, sans, sans, graffiti    Asymmetric Greek Y: graffiti, graffiti    Cyrillic У without rounded end: sans, sans

Λ / Л

Cyrillic Л looks like Greek Λ in some typefaces - e.g. in the inscription on Lenin's Mausoleum. In handwritten blockletters this form is common or even prevailing.

K / К