Why Israel is getting involved in Syria's internal fighting

Israel has shown little respect for international borders since becoming the unrivalled military hegemon of the Middle East.  Today that meant an Israeli airstrike on a government building in Damascus.

Israel says its attack on a Syrian defence ministry facility was intended as a warning to the new government: stay out of the part of southern Syria we have occupied or else.

Israel has moved into parts of the south of the country, built military bases and declared a line of control.

On Monday, Syrian tanks heading south to try and restore order following an outbreak of factional fighting were attacked by Israeli warplanes.

"The presence of such vehicles in southern Syria could pose a threat to Israel," stated the Israel Defence Forces.

In reality, Syria's ageing tanks pose minimal threat to Israel's state-of-the art military.

The Syrian armour was attacked as it entered the area around Sweida in the Druze heartland of southern Syria following factional fighting there.

The flare-up reportedly began with clashes between Bedouin and Druze groups that ended in scores killed.

The background to the escalation is complicated.

At least three Druze militia groups are divided in their loyalties to different religious leaders and differ over how they should respond to calls to assimilate into the new post-revolutionary Syria.

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Israel is becoming more and more involved in Syria's internecine war and says it will remain there indefinitely "to protect our communities and thwart any threat".

Its critics say Israel is operating a policy of divide and rule in Syria, weakening the fledgling government and creating a buffer zone to protect the border with the Golan Heights - originally Syrian territory that it has occupied and annexed for almost half a century.

Since the fall of the Assad regime, Israel has used airstrikes to destroy of much of Syria's military capability weakening its ability to impose control on outlying regions. This makes it more not less likely Israel will have a volatile unstable state on its northern border.

America and European powers have chosen to normalise relations with the new government in Damascus and lift sanctions.

In contrast Israel has occupied its territory, bombed its military and today hit one of its government buildings in the capital with an airstrike.

Since its crushing military campaigns against Hamas, Hezbollah and Iran, Israel has emerged as the unchallenged military power of the region.

There is however a limit to what blunt force can achieve alone. It requires diplomacy to achieve lasting gains and Israel's repeated assaults on multiple neighbours combined with its relentless campaign in Gaza are winning it few friends in the region.