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it's always russian people invading.
Let's cross check this statement against the historical record of invasions of what we now collectively know as Belorus, Russia and Ukraine.
A list of major invasions that took place that we have a historical record of:
- Mongol invasion of Kievan Rus' (1237–1242), a series of invasions that resulted in the Rus' states becoming vassals of the Golden Horde.
- Livonian campaign against Rus' (1240–1242), an unsuccessful Teutonic invasion of the Novgorod and Pskov Republics, in order to convert them to Catholicism.
- Russo-Crimean Wars (1570–1572), an Ottoman invasion that penetrated Russia and destroyed Moscow.
- Polish–Muscovite War (1609–1618), Poland gained Severia and Smolensk.
- Polish–Lithuanian occupation of Moscow (1610-1612). The Polish-Lithuanian Commonwealth occupation of Moscow took place between 1610 and 1612 during the Polish–Muscovite War, when Moscow was sacked and the Kremlin was occupied by a Polish-Lithuanian garrison under the command of Stanisław Żółkiewski.
- Ingrian War (1610–1617), a Swedish invasion which captured Novgorod and Pskov.
- Swedish invasion of Russia (1708–1709), an unsuccessful Swedish invasion, as part of the Great Northern War (1700–1721).
- French invasion of Russia (1812), an unsuccessful invasion by Napoleon's French Empire and its allies, as part of the Napoleonic Wars (1803–1815).
- Crimean War (1853–1856), a series of conflicts between the Ottoman Empire, the British Empire, France, Sardinia and the Russian Empire, including an Allied invasion of the Crimean Peninsula.
- Japanese invasion of Sakhalin (1905), an invasion and annexation by the Japanese, as part of the Russo-Japanese War (1904–1905).
- Eastern Front (World War I) (1914–1918), Russia was forced to cede Ukraine, Belarus, and the Baltic states to Germany as the Russian Empire collapsed.
- Caucasus campaign (1914–1918), a series of conflicts between the Russian Empire, its various successor states, and the Ottoman Empire during World War I.
- Allied intervention in the Russian Civil War (1918–1925) and the contemporaneous Polish–Soviet War (1918/9–1921), the Polish occupation of Belarus and West Ukraine.
- Japanese intervention in Siberia (1918–1922), an occupation of the Russian Far East by Japanese soldiers during the Russian Civil War (1917–1923).
- Operation Barbarossa (1941), an unsuccessful invasion of the Soviet Union led by Nazi Germany that started the Eastern Front (World War II) of 1941–1945.
The list above does not include constant «minor» invasions over a succession of multiple centuries of nomadic tribes (Cumans, Kipchaks, Pechenegs) from the south and from the south-east of what we now know as Russia and Kazakhstan.
If we average that list out, Russia historically has been a subject to a major invasion every 47.2 years ((1945 - 1237) ÷ 15) over the between 1237 and 1945. The 47.2 years figure is, of course, nonsensical from the historical point of view but lends a perspective of the average frequency of major invasions.
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As a bonus, there is also a list of planned invasions:
- Kantokuen (1941), an aborted plan for a major Japanese invasion of the Russian Far East during World War II.
- Operation Unthinkable (1945), a proposed contingency plan for an Anglo-American invasion of the Soviet Union developed by the British Chiefs of Staff during the later stages of World War II.