KEY POINTS
  • Diplomatic ties between Washington and Berlin have declined markedly in recent years.
  • Disagreements over defense spending, energy infrastructure, the G-7 and trade continue to be problems.
  • Germany's foreign minister appeared to warn Sunday that relations between the two countries may never be the same again. 
Germany's Chancellor Angela Merkel (R) looks at US President Donald Trump (R) walking past her during a family photo as part of the NATO summit at the Grove hotel in Watford, northeast of London on December 4, 2019.

Diplomatic ties between Washington and Berlin have declined markedly in recent years and Germany's foreign minister has appeared to warn that relations between the two countries may never be the same again. 

In the biggest signal yet of how strained relations have become, Heiko Maas said this weekend that the alliance with the U.S. — which is important in terms of economics, defense and security — might not recover even if President Donald Trump's rival for the White House, Democrat Joe Biden, won the forthcoming election.