U.S. President Donald Trump has said he is working with Poland on addressing threats from Russia and reiterated his calls for NATO members to meet their financial obligations.

Trump made the comments on a visit to Poland that had been billed as an opportunity for him to patch up relations with the North Atlantic treaty Organisation, which trump once called “obsolete”.

Speaking at a joint news conference with polish President Andrzej Duda, Trump also said Washington was thinking about “Severe Things” in response to North Korea’s test-launch this week of an intercontinental ballistic missile with the potential to reach Alaska.

En route to a potentially fractious G20 summit in Germany, Trump takes part in a gathering of leaders from central Europe, Baltic States and the Balkans, an event convened by Poland and Croatia to boost regional trade and infrastructure.