Since this is a clear violation of UN resolutions, I wonder what the UN will do about it?

The Lebanese security forces exposed a network which planned to assassinate 36 senior anti-Syrian Lebanese officials, the Lebanese newspaper al-Mustaqbal reported Wednesday morning.
The newspaper, which belongs to the family of former Lebanese Prime Minister Rafik Hariri, who was assassinated last year, reported that the Lebanese security forces managed to arrest two of the network’s key members.
According to the report, the investigation revealed that the network trained in Palestinian refugee camps in Lebanon and planned to execute a plot initiated by the Syrian government to assassinate 36 senior Lebanese officials.
[…]
According to the report, the investigation revealed that the Syrian government, through this plan, carried out the most blatant violation of United Nations Resolutions 1559 and 1701 and interfered in internal Lebanese issues.
[…]
In addition, it should be noted that Saad Hariri, Rafik Hariri’s son and head of the faction that constitutes the majority in the Lebanese parliament, recently harshly criticized President Bashar Assad and the Syrian regime and claimed that they were operating in an attempt to damage the political stability inside Lebanon and were even inciting an internal Lebanese war.

(via)
Why wouldn’t Syria try to overthrow the government of Lebanon? Who will stop it?