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Salt is damaging to all plants, trees, shrubs and lawns.

Here is a link with more information and how to disapate the effects of road salts.

https://www.gardeningknowhow.com/plant-problems/environmental/salt-damage-in-winter.htm

Cypress can be harmed and even die from several diseases.
You may need to inspect the tree closer to look for more identifying signs.

This link has great information.

https://www.ces.ncsu.edu/depts/pp/notes/Ornamental/odin17/od17.htm

https://www.gardeningknowhow.com/ornamental/trees/cypress/growing-cypress-trees.htm

Your shrubs could be declining due to age, winter damage, water issues or disease.

You can prune out the dead plant material and inspect the plants for any other signs of pests or disease.

The link below will refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/shrubs/russian-cypress/russian-cypress-care.htm

This link will help you pinpoint the cause.

http://extension.uga.edu/publications/detail.html?number=B1229

Check your watering. Newly planted shrubs or trees need daily water for the first 2 weeks.
Make sure the soil is moist but not soggy.
You can add 3 to 4 inches of hardwood mulch to help with moisture retention.
Also make sure that the Cypress was placed at the same depth it was in the previous planting location.

https://www.gardeningknowhow.com/ornamental/trees/cypress/growing-cypress-trees.htm

True European cypress is not cold hardy and can't tolerate temperatures under 20 degrees, so it's unlikely to be a good choice for your location. There are several trees known as "false cypress" that may have a similar appearance, and some of these are more cold-hardy.