By Joyce Lee and Hyunjoo Jin

SEOUL (Reuters) -U.S. President Donald Trump hosts South Korean President Lee Jae Myung in Washington for their first summit meeting on Monday, after the countries struck a trade deal last month lowering U.S. tariffs on the Asian ally to 15% from a threatened 25%.

Alongside trade, U.S. pressure to redefine the decades-long military alliance is likely to be a focus, while Trump has said more South Korean investment plans will be announced in addition to a $350 billion package agreed last month.

Here are some of the main items that could be discussed.

DEFENCE COSTS

Trump has accused its Asian ally of “free-riding” on U.S. military might, with some 28,500 American troops stationed in South Korea to deter nuclear-armed North Korea.

Just before Trump won the p

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