** Shares in German defence companies rise between 3% and 21% in early Frankfurt trade after the Trump-Zelenskiy clash in the White House and a report on talks for a potential German defence fund
** A Reuters exclusive on Sunday said parties in talks to form Germany's new government are weighing a 400 billion euro ($416.32 billion) defence fund
** At a summit in London on Sunday, European leaders also agreed they must spend more on defence but did not provide details of their plan
** Hensoldt HAGG.DE, which provides sensor systems for the Eurofighter, is the top gainer with a 21% jump
** Leopard 2 tanks maker Rheinmetall RHMG.DE gains 15%, while MTU Aero Engines MTXGn.DE rises 2.5%
** Thyssenkrupp TKAG.DE, whose shares have gained 93% YTD, rises 6% in premarket
** Tank gearbox maker Renk R3NK.DE gains 14% and sits at the top of Germany's small-cap index .SDAXI
($1 = 0.9608 euros)
(Reporting by Paolo Laudani)
((Paolo.laudani@thomsonreuters.com))