The D-215 is a "small missile ships" at soviet classification. May be should classified as corvette... Armed by supersonic anti ship cruise missiles with vertical launch. For selfdefence used 76-mm auto cannon
The D-225 is a "small missile ships" at soviet classification. May be should classified as corvette... Armed by supersonic anti ship cruise missiles. For selfdefence used twin 76-mm auto cannon and 4th 6x20 mm gatling gun for AA defence.
The D-245 is a hydrofoil corvette armed by one 213 mm 6-barreled anti-submarine rocket launcher (looks like as RBU-6000), two turrets with 2x76 mm auto cannon, 4th torpedo launchers, cruise missiles and anti-air missiles with vertical launch.
The D-170 is a hoverborne (Surface Effect Ship (SES) or Sidewall Hovercraft) small missile boat. Armed by 12 supersonic anti-ship missiles, one 45 mm auto-cannon and 6 short range anti-air missiles (look like AA 9K38 Igla - NATO reporting name SA-24 Grinch)
The D-310 is a lovechild of battleship, missile cruiser and aircraft carrier. This one carry 4 conventional takeoff aircraft for AA defence and 4 helicopter for S&R and ASW mission. Armed by artillery and cruise missiles.