Republican presidential candidate Donald Trump said Tuesday that he is willing to talk to North Korean leader Kim Jong-un to try to stop Pyongyang's nuclear program, proposing a major shift in US policy toward the isolated nation.

In a wide-ranging interview with Reuters, Trump also called for renegotiation of the Paris climate accord, said he disapproved of Russian President Vladimir Putin's actions in Ukraine, and said he would seek to dismantle most of the US' Dodd-Frank financial regulations if he were to be elected president.

The presumptive Republican nominee declined to share details of his plans to deal with North Korea, but said he was open to talking to its leader.

"I would speak to him, I would have no problem speaking to him," Trump said.

Asked whether he would try to talk some sense into the North Korean leader, Trump replied, "Absolutely."

North Korea's mission to the UN did not immediately respond to a request for comment on Trump's remarks.

Trump, 69, also said he would press China - Pyongyang's only major diplomatic and economic supporter - to help find a solution.

"I would put a lot of pressure on China, because economically we have tremendous power over China," he said in the interview in his office on the 26th floor of Trump Tower in Manhattan. "China can solve that problem with one meeting or one phone call."

A Chinese official said dialogue was needed to resolve issues on the Korean peninsula.

"China supports direct talks and communication between the US and North Korea. We believe this is beneficial," Foreign Ministry spokesman Hong Lei told reporters.

Trump's readiness to talk directly with Kim contrasts with President Barack Obama's policy of relying on senior US officials to talk with senior North Korean officials.

Obama has not engaged personally with Kim, but he has pushed for new diplomatic overtures to Iran and Cuba that produced a nuclear deal with Tehran and improved ties with Havana.

Sitting at his desk with an expansive view of Central Park, Trump spoke at length about his economic and foreign policy ideas in the half-hour interview.

On Russia, Trump tempered his past praise of Putin, saying the nice comments that the Russian leader has made about him in the past can only go so far.

"The fact that he said good things about me doesn't mean that it's going to help him in a negotiation. It won't help him at all," he said.

An adviser to Hillary Clinton criticized Trump's foreign policy comments, noting they came soon after Trump said he was unlikely to have a good relationship with British Prime Minister David Cameron.