DAVID Cameron warns that unless “warmonger” Vladimir Putin is stopped in Ukraine he will be back for more.

The former Prime Minister writes exclusively about his new job as Foreign Secretary for the first time in today’s Sun on Sunday.

And he reveals his plan to fly to our “closest and strongest ally” Washington DC next week to bang the drum for Ukraine.

A debate is underway in the US over how much to help Ukraine and for how long.

“I know the arguments – that European security is American security and that dictators shouldn’t be appeased – will win the day,” Lord Cameron says.

In a dramatic twist the ex-Tory leader was granted a peerage by King Charles three weeks ago to allow him to accept the senior role in Rishi Sunak’s Cabinet.

“It is hard to recall in recent memory a time of such danger and uncertainty,” he writes.

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Lord Cameron describes visiting a bombed out cathedral in Ukraine and an Israeli kibbutz where parents were slaughtered in front of their children.

He stresses we must understand how the world has changed: “The forces shaping it – a warmonger in the Kremlin, a more aggressive China, Islamist extremism poisoning young minds – these things aren’t going to disappear overnight.

“There’s no point hoping for some magical return to the world as it once was. Hope isn’t a policy.”

In the strongly-worded piece, he adds: “If Putin isn’t stopped in Ukraine he will be back for more.

“And we know from our history that appeasing dictators ultimately wrecks British interests and costs British lives.”

Conflict in the Middle East can destabilise our allies, trigger mass migrations and deeply affect Jewish and Muslim populations, he adds.

Lord Cameron says we must build up our defences, stay close to our friends and reach out to new allies because we cannot insulate ourselves from these crises.

However, he says if we turn this moment of “danger and insecurity” into something that brings a new sense of unity between allies “there is no reason why we cannot prevail”.