U.S. President Donald Trump, left, speaks as he is greeted by Chinese President Xi Jinping at Zhongnanhai Garden in Beijing, China, Friday. (Evan Vucci/Pool Photo via AP)

BEIJING (AP) — U.S. President Donald Trump said Friday that he has not made a decision on whether to move forward with a major arms package for Taiwan after hearing concerns about it from Chinese President Xi Jinping.

Trump’s comments on Taiwan — a self-ruled island that China claims as its own territory — came as he flew back to Washington after wrapping up critical talks in which both leaders said important progress was made in stabilizing U.S.-China relations even as deep differences persist between the world’s two biggest powers on Iran and Taiwan.

“I’ll be making decisions,” Trump said. “But, you know, I think the last thing we need right now is a war that’s 9,500 miles away.”

Trump’s Republican administration in December authorized a record-setting $11 billion weapons package for Taipei, but it has yet to move forward. Lawmakers also approved a $14 billion arms sale to Taiwan in January, but the sale cannot advance until Trump formally sends it to Congress. China opposes such sales and has suggested that Washington’s relationship with the self-governing island is the key factor in U.S.-China relations.

Trump said Xi also reiterated China’s strong opposition to Taiwan’s independence. “I heard him out,” Trump said. “I didn’t make a comment.”

Trump’s consultation with Xi about arms sales to Taiwan may violate the so-called Six Assurances, a set of nonbinding U.S. policy principles formulated in 1982 under President Ronald Reagan that have helped guide the U.S. relationship with Taipei, according to analysts.

The second of the Six Assurances states that the U.S. “did not agree to consult with the People’s Republic of China on arms sales to Taiwan.”

Trump said the issue of the 1982 assurances came up in the talks with Xi.

Trump also said he raised a potential three-way nuclear deal that would involve the U.S., Russia and China. He wants each of the three countries to sign a pact that would cap the number of nuclear warheads in their arsenals. China has previously been cool to entering such a pact.

Beijing’s arsenal, according to Pentagon estimates, exceeds 600 warheads and is far from parity with the U.S. and Russia, which are each estimated to have more than 5,000 warheads. But Trump suggested Xi was receptive to the idea.

“I got a very a positive response,” Trump said. “This is the beginning.”

The last nuclear arms pact, known as the New START treaty, between Russia and the United States expired in February, removing any caps on the two largest atomic arsenals for the first time in more than a half-century. As the treaty was set to expire, Trump rejected a call by Russia to extend the two-country deal for another year and called for “a new, improved and modernized” deal that includes China.

The Pentagon estimates China will have more than 1,000 nuclear warheads by 2030.

Xi welcomed Trump at his official residence, Zhongnanhai, on Friday for their final engagement of the summit before the U.S. leader’s return to Washington. The leaders took a short walk through the grounds that feature ancient trees and Chinese roses, and they strolled through a covered passageway with green columns and archways painted with birds and traditional Chinese mountain scenes.

Over tea and lunch, Trump and Xi — with top aides and translators in tow — huddled for nearly three hours of talks before the U.S. leader completed his three-day visit to China.

Trump appeared impressed by the bucolic grounds, remarking that the roses were the most beautiful he had ever seen. Xi promised to send him some rose seeds.

“It’s been really a great couple of days,” Trump told reporters.

Xi, for his part, called it a “milestone” visit. “We have established a new bilateral relationship, or rather a constructive, strategic, stable relationship,” he said.

But the optimistic outlook collides with some difficult truths about the thorniest issues between the two superpowers.

In recent weeks, the U.S. State Department has accused Chinese firms of providing satellite imagery to the Iranian government, and the Treasury Department has moved to target Chinese oil refineries accused of buying oil from Tehran, as well as shippers of the oil.

Xi on Thursday warned Trump during private talks that their differences on Taiwan, if handled poorly, could hurtle the world’s dominant powers toward “clashes and even conflicts,” according to Chinese government officials.