Europe seen slightly higher; Ukraine watched By: CNBC.com News April 28, 2014 at 00:48 AM EDT European shares are set for a slightly higher open on Monday although any bullish sentiment is expected to be capped by ongoing events in Ukraine. Read More >> Related Stocks: Alstom S.A. Astrazeneca Plc ADR General Electric Pfizer Stmicroelectronics ADR Swedbank Ab Twitter, Inc.