India, July 16 -- US President Donald Trump has said that he is disappointed but not done with Vladimir Putin, days after he announced a tougher stance against Russia for its three-year-old war in Ukraine.

"I'm disappointed in him, but I'm not done with him. But I'm disappointed in him," Trump told the BBC in an interview.

Trump said he believed a deal to end the Ukraine war was possible with Russia on four separate occasions.

"We'll have a great conversation. I'll say: 'That's good, I'll think we're close to getting it done,' and then he'll (Putin) knock down a building in Kyiv," the US president said.

Since taking office, Trump has been pursuing a ceasefire agreement between Ukraine and Russia. However, as no ceasefire appears immin...