You don't. Like many spoken languages such as Russian and Latin, American Sign Language has no signs for articles such as "the" and "a".

Tha depends on which sign language you mean - American Sign Language or British Sign Language or Russian Sign Language or Australian Sign Language. In American Sign Language the letter D is formed by extending upwards the index finger and then making a round shape with the thumb and other fingers over the palm.

Russian is a Cyrillic language.

No, Russian is a Slavonic language.

You mean in Russia? Russian is their main language.