April 28 Premarket Briefing: 10 Things You Should Know

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Updated from 6:56 a.m. EDT .

Here are 10 things you should know for Monday, April 28:

1. 
-- U.S. stock futures were rising Monday and European stocks were higher on mergers-and-acquisitions news.

Asian shares ended mostly lower as tensions in Ukraine continued to rattle global markets. Japan's Nikkei 225 declined 1%.

2. -- The  economic calendar  in the U.S. on Monday includes pending-home sales for March at 10 a.m. EDT.

3. -- U.S. stocks  on Friday traded lower amid rising tension in Ukraine.

The Dow Jones Industrial Average  fell 0.81% to 16,361.78, while the  S&P 500  lost 0.81% to close at 1,863.41. The  Nasdaq tumbled 1.75% to 4,075.56. The Dow, S&P and Nasdaq for the week declined 0.29%, 0.08% and 0.49%, respectively.

4. -- AstraZeneca  shares soared in early trading on Monday after Pfizer  publicly disclosed details of a $100 billion bid approach.

PfiZer, the maker of Viagra, said Monday that AstraZeneca rejected an initial approach in January valuing the  company at about 59 billion pounds ($100 billion). The cash and shares deal would represent a 30% premium on AstraZeneca's closing share price of 35.26 pounds on Jan. 3, the date of the offer.

The board of AstraZeneca on Monday issued a statement saying  "absent a specific and attractive proposal, it was not appropriate to engage in discussions with Pfizer." 

AstraZeneca said its "board remains confident in the ongoing execution of AstraZeneca's strategy as an independent company and that its successful delivery will create significant value for shareholders."

AstraZeneca rose 16.8% in premarket trading to $80.20; Pfizer rose 2% to $31.35.

5. -- France will block any deal involving  engineering group Alstom it considers unfit,  Economy Minister Arnaud Montebourg said ahead of a meeting between President Francois Hollande and General Electric CEO Jeff Immelt to discuss Alstom's future, Reuters reported.

The meeting between the French head of state and the GE boss follows a weekend in which Alstom's German rival Siemens proposed a swap of assets to counter a potential Alstom-GE tie-up.

6. -- A newly discovered flaw affecting several versions of Microsoft's Internet Explorer has left a significant portion of the world's Web browsers vulnerable to attack, Recode reported.

Disclosed in an unusual Saturday alert from Microsoft, the flaw is being called a serious "Zero Day" vulnerability by security company FireEye, which claims it affects more than 56% of the world's Web browsers currently in use.

It's a remote code execution vulnerability, which in English means a bad guy can make a target computer run software after a successful attack, Recode explained. 

Microsoft shares rose 0.4% in premarket trading.

7. -- Comcast said Monday it would divest systems resulting in a loss of about 3.9 million video customers as part of its proposed merger with  Time Warner Cable .