The 60 meter long, 266 dwt icebreaker Eva-316 collided with the 100 meter long, 4400 dwt freighter Lettland in the Gulf of Riga near the island of Kihnu, Estonia.   Damage was slight on both vessels with the Lettland suffering a small 40 centimeter hole along its hull.   The Lettland continued on to Iggesund from Pärnu while the Eva-316 continued with its icebreaking duties.  No reports of injuries or pollution being released.