President Trump called China the "economic lifeline" to North Korea and said the world's most populous country could help put an end to Kim Jong Un's regime.

"China is very much the economic lifeline to North Korea so, while nothing is easy, if they want to solve the North Korean problem, they will," Trump tweeted Friday.

Trump has used Twitter in recent weeks to put pressure on China to step up its involvement in pressuring Kim to not test nuclear weapons and ballistic missiles. He's said China is the key to ending North Korea's aggressive actions in the Asian Pacific.

During a meeting with Chinese President Xi Jinping earlier this month, Trump emphasized that he wanted China to play a larger role in combatting North Korean aggression. In a tweet following that meeting, Trump said he would offer trade concessions to China for help solving diplomatic problems with North Korea.

Vice President Mike Pence has been on a trip to the region this week and made similar calls on American Asian allies to twist the screws on North Korea.