From PBS NewsHour.

President Trump on Thursday rejected an offer from Russia to temporarily extend caps on strategic nuclear weapons. It comes as the treaty that held them in check called New START expired the same day.

In a social media post, the president called it, "A badly negotiated deal" and added, "we should have our own nuclear experts work on a new, improved and modernized treaty."

The Kremlin said it regrets the expiration of the last remaining nuclear arms pact between the two nations.

President Trump has indicated he wants to involve China in any new potential treaty, an idea that Beijing has resisted.

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