What does "Ringtausch" mean?
Germany is not only supplying heavy weapons itself, but is also trying to get other countries to provide more heavy weapons support to Ukraine.

For this purpose, the "Ringtausch" program was created. Roughly translated, it means "circular exchange". Germany supplies weapons to a third nation, while this nation in return gives its own weapons to Ukraine.
Ringtausch overview (as of: 01/06/2023)
Nations Amount & Systems
Greece 40 BMP-1A1-Ost
Slovakia 30 BVP-1
Slovenia 28 M-55S
Czech Republic ~40 T-72
Deliveries to Ukraine (total) 70 BMP-1, 28 M-55S, ~40 T-72
Ringtausch detail view (as of 01/06/2023)
Germany Foreign nation Foreign nation Ukraine Source
14 Leopard 2A4 & 1 Büffel 14 Leopard 2A4 & 1 Büffel ~40 T-72 ~40 T-72 forbes.com
40 Marder IFV 40 Marder IFV 40 BMP-1A1-Ost 40 BMP-1A1-Ost rnd.de
28 M-55S 28 M-55S bmvg.de
15 Leopard 2A4 15 Leopard 2A4 30 BVP-1 30 BVP-1 rnd.de