OnlyOffice is ok. Yes, russian team started the project years ago, but it is now true international project, open source code available for audits and used by enterprises in high-security industries (also in Cryptpad)
It is a good product (I have it on my PCs), but I really prefer desktop first, old style programs on my computer, e.g LibreOffice, Softmaker/FreeOffice (even though it’s proprietary)