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President Donald Trump has warned that the US will bolster its nuclear arsenal to put pressure on Russia and China. Speaking to reporters, he repeated his belief that Russia has violated the 1987 Intermediate-Range Nuclear Forces (INF) treaty, which he has threatened to leave. Russia denies this.
The Cold War-era treaty banned medium-range missiles, reducing the perceived Soviet threat to European nations.
Russia has warned it will respond in kind if the US develops more weapons. Mr Trump said the US would build up its arsenal "until people come to their senses".
[...] Meanwhile, US National Security Adviser John Bolton has been holding talks in Moscow after Russia condemned the US plan to quit the deal. Mr Bolton was told that the US withdrawal would be a "serious blow" to the non-proliferation regime.