UPDATE 1-UK Stocks-Factors to watch on April 28
(Adds futures, news)
LONDON, April 28 (Reuters) - Britain's FTSE 100 index is seen opening higher on Monday, with June futures on the index up 0.5 percent by 0641 GMT. For more on the factors affecting European stocks, please click on
* The UK blue chip index slipped on Friday from its seven-week closing high the day before, ending down 17.31 points, or 0.3 percent, at 6,685.69 points, knocked back by concerns surrounding the situation in Ukraine.
* The United States and Europe are preparing new sanctions against Russia as tensions escalated in eastern Ukraine. Pro-Russian rebels paraded European monitors they are holding on Sunday, freeing one but saying they had no plans to release another seven.
* It is a quiet day in terms of scheduled corporate news, with no UK blue chips set to report results.