U.S. and Israeli leaders gathered Wednesday in Warsaw for a conference they hope will pile pressure on Iran, as Britain held out hope for progress on Yemen's humanitarian crisis.

There is still time to find a solution to Britain's exit from the EU, German Chancellor Angela Merkel said Tuesday, voicing optimism on a political deal over the tricky "backstop" that has stymied progress.

Germany said Friday that Russia had "de facto invalidated" a landmark Cold War missile reduction treaty which the US is poised to abandon, with Europe anxious at the prospect of a new arms race.

A US deadline for Russia to come back into compliance with the Intermediate-Range Nuclear Forces (INF) treaty expires on Saturday but Secretary of State Mike Pompeo will reportedly announce the pullout as early as Friday.

Hundreds of flights were cancelled at eight German airports Tuesday, including at the nation's busiest travel hub Frankfurt, as security staff walked off the job in a deepening row over pay.

Germany "takes total responsibility for crimes committed" by the Nazis in Greece, Chancellor Angela Merkel said Friday on a visit to Athens.

Almost 640 flights were cancelled in Germany Thursday as security staff went on strike at three airports, meaning disruption for around 100,000 passengers.

Germany was plunged into transport chaos Monday as train services were halted by a railworkers' strike over pay, affecting millions of passengers.

Germany will bar 18 Saudis from entering its territory and Europe's Schengen passport-free zone over their alleged links to the murder of Jamal Khashoggi, Foreign Minister Heiko Maas said Monday.

Shifting tectonic plates in German politics are set to mark a second regional election in as many weeks Sunday, threatening fresh aftershocks for Chancellor Angela Merkel's battered Berlin coalition.

Turkish President Recep Tayyip Erdogan arrived in Germany Thursday for a controversial three-day state visit that both sides hope will help rebuild relations that have been battered in recent years.